Most solo operators and small business owners start with a single business checking account. Income lands, expenses leave, and somewhere in that one balance is the money you owe the IRS next quarter, the contractor invoice due Friday, and the payroll run at the end of the month. It all looks like available cash until it isn't.
Sub-accounts — also called envelopes, pockets, or savings buckets depending on the bank — solve this without requiring you to open five accounts at five different banks. The right banking setup lets you ring-fence money by purpose the moment it arrives, automate the splits, and know at a glance what is actually yours to spend. This comparison covers the providers that do this best for solo operators and small teams, what each costs, and how to choose.
For a broader look at how your banking layer fits into a complete financial system, see the Solo Financial OS.
Quick Answer: The Best Business Bank Accounts with Sub-Accounts
| Provider | Sub-Account Type | Max Sub-Accounts | Monthly Fee | Best For |
|---|---|---|---|---|
| Relay | Separate checking accounts + virtual cards | 20 accounts, 50 cards (free tier) | $0 (free) / $30 Pro — verify current pricing | Operators who want true multi-account structure with card control |
| Lili | Tax Bucket + Savings Goals | Multiple savings buckets (plan-dependent) | $0 basic / paid tiers — verify current pricing | Freelancers who want automatic tax withholding built in |
| Found | Envelopes (pockets) | Multiple pockets | $0 basic / Found Plus — verify current pricing | Self-employed with light bookkeeping needs who want tax automation |
| Mercury | Multiple checking + savings accounts | Unlimited accounts (practical limit varies) | $0 — verify current terms | Tech-forward operators, startups, those needing API access |
| Bluevine | Sub-accounts (Business Checking Plus) | 5 sub-accounts on paid tier — verify current terms | $0 basic / $95/mo Plus — verify current pricing | Operators who also want a high-yield balance on the main account |
Pricing, features, and account limits change. Verify current terms directly with each provider before opening an account.
Who This Guide Is For
This article is written for solo operators, freelancers, consultants, LLCs, and small-team businesses who:
- Earn variable or project-based income and need to allocate it immediately
- Are tired of guessing how much of their balance is "safe to spend"
- Want to automate a tax reserve without opening a separate savings account at another bank
- Manage owner pay separately from business operating expenses
- Run a simple but intentional financial system without a full-time bookkeeper
If you run a larger operation with dedicated finance staff, payroll systems, and multiple entities, you likely need a more traditional treasury setup and this guide is less relevant to you.
The Core Decision Framework
Before comparing specific products, decide what kind of separation you actually need. There are two meaningfully different architectures:
Architecture 1: True Separate Accounts (Relay, Mercury)
Each sub-account is a distinct checking or savings account with its own balance, and optionally its own debit card. Transfers between them are instant. In your accounting software, each account can be mapped to a separate ledger account. This is the cleanest structure for operators who want maximum visibility and card-level spend control (e.g., one card that only draws from the "operating expenses" account).
Architecture 2: Buckets or Envelopes Within One Account (Lili, Found)
The underlying account is one legal checking account, but the interface shows you virtual envelopes or savings goals. Money allocated to a bucket is reserved but technically still in one account. This is simpler to set up and often includes automation features like "set aside 28% of every deposit automatically." It is excellent for freelancers who want the tax-reserve habit enforced without manual effort.
Product Analysis
Relay — Best Overall for Multi-Account Structure
What it is: Relay is a business banking platform (banking services provided through Thread Bank, Member FDIC — verify current banking partner and FDIC status) built explicitly for the multi-account workflow. The free tier supports up to 20 separate checking accounts and up to 50 virtual debit cards. Each account can be named, and each card can be locked to a specific account.
How the sub-accounts work: You open one Relay account and then create named checking accounts inside the dashboard — "Tax Reserve," "Operating," "Owner Pay," "Equipment Fund," etc. Incoming deposits land in whichever account you designate. You can set up auto-transfer rules so a percentage of every deposit routes to your tax account automatically.
Integrations: Relay has direct integrations with QuickBooks Online and Xero. Each sub-account can be mapped as a separate account in your chart of accounts, which makes bank reconciliation cleaner than almost any other option here. If your accounting setup is important, this integration depth matters.
Pricing: The base Relay account has no monthly fee and no minimum balance as of mid-2026. Relay Pro (approximately $30/month — verify current pricing directly with Relay) adds features like same-day ACH, auto-transfer rules with more sophistication, and additional team permissions. Most solos start on the free tier and upgrade when they have team members or need the automation features.
Trade-offs: Relay does not pay meaningful interest on checking balances on its free tier (verify current rates). If you hold significant idle cash, you may want a separate high-yield account. Relay is a fintech platform, not a traditional bank — understand the pass-through insurance structure before depositing large sums.
Best for: Operators who want the cleanest multi-account structure, card-level spend control, and direct accounting software integration. The go-to recommendation for most solos building an intentional financial system.
Lili — Best for Automated Tax Withholding
What it is: Lili is a business banking app designed specifically for freelancers and self-employed people (banking services through Choice Financial Group and other partners — verify current banking partner and FDIC status). Its signature feature is the Tax Bucket: you set a withholding percentage and every time money comes in, Lili automatically moves that percentage into a protected tax savings area.
How the sub-accounts work: The Tax Bucket is the centerpiece. Higher-tier plans also include savings goals (named buckets for things like equipment or emergency fund). The Tax Bucket shows you an estimated tax liability and reminds you of upcoming estimated tax deadlines — it does not file your taxes, but it enforces the saving habit automatically.
Pricing: Lili offers a free basic tier. Paid plans (Lili Pro, Lili Smart, Lili Premium at various price points — verify current plan names and pricing directly with Lili) add features like unlimited invoicing, accounting tools, cash-back rewards, and additional savings goals. Pricing and plan structure change; check Lili's site for current details.
Trade-offs: Lili is purpose-built for solos and freelancers, which means it is less suited to businesses with employees, multiple revenue streams needing separate card control, or deep accounting integration requirements. It is more of a "guided solo finance" product than a flexible multi-account platform.
Best for: Freelancers and self-employed operators who want the tax bucket to run on autopilot and appreciate an app experience designed for their specific situation. Pairs well with simple invoicing needs.
Found — Best for Self-Employed with Built-In Bookkeeping
What it is: Found is a banking and bookkeeping platform for self-employed people (banking services provided through Piermont Bank, Member FDIC — verify current banking partner and FDIC status). It combines a checking account, expense categorization, invoicing, and envelope-style tax savings into one app.
How the sub-accounts work: Found uses "pockets" — envelope-style containers within the account. The tax pocket is the most prominent feature: you set a percentage, and Found automatically sweeps that amount from each deposit. Found Plus (the paid tier) expands the bookkeeping features and integrations.
Pricing: Found has a free tier. Found Plus is a paid subscription (verify current pricing directly with Found, as plan details change). The free tier covers the core banking and basic tax pocket. The paid tier adds more sophisticated auto-categorization, Schedule C prep assistance, and accounting integrations.
Trade-offs: Found is designed to be an all-in-one for the solo self-employed person — if you already have a dedicated accounting tool like QuickBooks, Found's built-in bookkeeping may overlap confusingly with it. The envelope system is less flexible than Relay's true multi-account structure. Less suitable as a team scales.
Best for: Self-employed sole proprietors and single-member LLCs who want banking, light bookkeeping, invoicing, and tax savings in one app without juggling multiple tools. A good entry-level financial OS for a true solo.
Mercury — Best for Tech-Forward Operators and Startups
What it is: Mercury is a fintech banking platform (banking services through Evolve Bank & Trust and Choice Financial Group — verify current banking partners and FDIC status) popular with startups, e-commerce businesses, and tech-adjacent operators. It supports multiple checking and savings accounts, a robust API, and clean integrations.
How the sub-accounts work: Mercury lets you open multiple checking and savings accounts under one login with no monthly fee. You can label and use them exactly like Relay's sub-accounts. Mercury also offers high-yield savings accounts (verify current rates) and Treasury access for larger balances.
Pricing: Mercury has no monthly fee on its standard tier as of mid-2026. Mercury Scale (a paid tier) adds enhanced features for growing teams — verify current pricing and plan details directly with Mercury.
Trade-offs: Mercury does not have the freelancer-specific tax automation features of Lili or Found. It is a more general-purpose business banking platform that happens to support multiple accounts well. Customer support has historically been noted as leaning toward digital channels. Not available to all business types — verify eligibility.
Best for: Operators comfortable with a self-directed banking setup, startups that may need API access or venture/investor integrations, and businesses that want high-yield savings on idle cash within the same platform.
Bluevine — Best for High-Yield Plus Sub-Accounts
What it is: Bluevine is a business checking account (banking services provided through Coastal Community Bank — verify current banking partner and FDIC status) known for paying interest on checking balances. Its standard account does not include sub-accounts, but Bluevine Business Checking Plus (the paid tier) adds sub-account capability.
How the sub-accounts work: Bluevine Plus includes up to five sub-accounts (verify current limits and plan terms directly with Bluevine). Each sub-account has its own account number, which is more true-account structure than envelope-style buckets.
Pricing: The base Bluevine account has no monthly fee. Bluevine Business Checking Plus is approximately $95/month as of the time of writing — verify current pricing directly with Bluevine, as this is a significant cost that may or may not be worth it depending on your balance and transaction volume. The interest earned on large balances may offset the fee, but run the math for your specific situation.
Trade-offs: The sub-account feature being gated behind a $95/month plan makes Bluevine less competitive on cost for solos who primarily want envelope budgeting. If you hold large idle balances and want yield plus some sub-account structure, the math may work in your favor. For most solos, Relay or Mercury are more cost-effective for the same structural outcome.
Best for: Operators holding larger cash balances who want to earn interest on operating cash and also want some sub-account structure, and whose transaction volume and balance justify the Plus fee.
Side-by-Side Decision Table
| Feature | Relay | Lili | Found | Mercury | Bluevine |
|---|---|---|---|---|---|
| True separate accounts (own account number) | Yes | No (buckets) | No (pockets) | Yes | Yes (Plus tier) |
| Auto tax withholding | Via rules (Pro) | Yes (core feature) | Yes (core feature) | Manual | Manual |
| Virtual debit cards per account | Up to 50 | Limited | Limited | Yes | Limited |
| Built-in bookkeeping/invoicing | No (integrates out) | Light invoicing | Yes (core feature) | No (integrates out) | No |
| QuickBooks / Xero integration | Yes (direct) | Limited — verify | Plus tier | Yes (direct) | Yes — verify depth |
| Interest on balances | Limited — verify | Some tiers — verify | Limited — verify | Savings accounts | Checking (verify rate) |
| Free tier available | Yes | Yes | Yes | Yes | Yes (no sub-accounts) |
Best-For Summary
| Situation | Recommended Provider |
|---|---|
| Operator who wants maximum structural flexibility and card control | Relay |
| Freelancer who wants tax withholding to happen automatically | Lili or Found |
| Solo who wants banking + light bookkeeping + invoicing in one app | Found |
| Tech startup or operator needing API access and multiple accounts | Mercury |
| High-balance operator wanting yield on operating cash | Mercury (savings) or Bluevine Plus |
| Operator already on QuickBooks who wants clean per-account sync | Relay or Mercury |
How to Set Up an Envelope Banking System in 5 Steps
Regardless of which provider you choose, the implementation logic is the same. Here is a practical starting framework — adjust the percentages based on your actual tax situation, which a CPA can help you determine.
- Open your account and create your sub-accounts. Start with four: Operating, Tax Reserve, Owner Pay, and Buffer/Emergency. You can add project-specific accounts later if you need them.
- Set the tax reserve percentage. A common starting point for self-employed individuals is 25–30% of gross deposits — but the right number depends on your entity type, deductions, state tax rate, and other factors. Consult a CPA or tax professional to set an accurate rate for your situation. The account structure enforces the habit; the math must come from your actual numbers.
- Configure auto-transfer rules. Relay Pro, Lili, and Found all support automated percentage-based transfers on incoming deposits. Set this up so the allocation happens without requiring a manual decision each time income arrives.
- Assign debit cards to the operating account only. If your bank supports virtual cards per account (Relay, Mercury), issue your day-to-day card from the operating account so you physically cannot accidentally spend from your tax reserve.
- Connect to your accounting software. Map each sub-account to its own account in QuickBooks, Xero, or whichever tool you use. This makes monthly reconciliation reflect the structure you have built and gives you clean reporting by purpose. See the accounting hub for software comparisons.
Costs: What You Actually Pay
Most of the platforms in this guide are free to start. The real costs to evaluate are:
| Cost Type | What to Watch |
|---|---|
| Monthly fees | Free tiers exist across all options; paid tiers add automation and team features. Relay Pro ~$30/mo, Found Plus and Lili paid tiers vary, Bluevine Plus ~$95/mo — all verify with provider. |
| Wire fees | Domestic and international wires may carry per-transaction fees. Check if your workflow requires wires or if ACH works. |
| ACH fees | Most free tiers include free incoming ACH; outgoing ACH is usually free on standard timelines. Same-day ACH may cost extra. |
| Cash deposit fees | All of these are fintech platforms with limited or no cash deposit support. If your business regularly handles cash, consider a traditional bank as your primary or a hybrid setup. |
| Opportunity cost of no yield | If you park $50,000 in a zero-interest checking account, you may be leaving meaningful interest income on the table. Mercury savings accounts and Bluevine checking offer yield (verify current rates). |
Common Mistakes When Using Sub-Accounts
Setting up accounts and never maintaining them. The structure only works if deposits are actually allocated and the balances stay meaningful. Review your sub-account balances monthly, not just when a tax bill arrives.
Treating the tax sub-account as a savings account. The money in your tax reserve is already spent — it is owed to the government. Do not borrow from it for business expenses and plan to replace it later. This is the most common way operators get into trouble with estimated tax shortfalls.
Using sub-accounts instead of bookkeeping. Sub-accounts track balances by purpose. They do not track income and expense categories, create profit and loss reports, or prepare you for tax filing. You still need accounting software or a bookkeeper for that layer.
Not connecting to accounting software. If each sub-account is not mapped in your books, you will reconcile everything manually — which defeats much of the efficiency gain. Most operators on Relay or Mercury can set this up once and rarely touch it again.
Over-complicating the structure early. Starting with eight sub-accounts before you understand your cash flow patterns usually means abandoned accounts and confusion. Start with four, operate for 60 days, then add based on actual need.
How This Fits Your Financial OS
In the Solo Financial OS framework, your banking layer is the foundation of your cash flow system. Sub-accounts are the mechanism that turns your bank account from a passive container into an active allocation tool. Money arrives, gets sorted, and each bucket has a job.
The layers above this — your accounting system, your tax strategy, your invoicing workflow — all depend on the foundation being solid. A business bank account that mixes all purposes together creates confusion that propagates upward: your P&L is harder to read, your tax reserve is uncertain, and owner pay becomes guesswork.
Getting the banking layer right is not glamorous. It is also not complicated. Pick a provider that matches your workflow, create four sub-accounts, automate the allocation, and connect it to your books. That one structural change removes more financial anxiety for solo operators than almost any other single action in the stack.
If you are building or auditing your full financial stack, the Financial Stack Builder can help you identify which tools fit your current stage.
FAQ
What are sub-accounts in a business bank account?
Sub-accounts (sometimes called envelopes, pockets, or savings buckets) are separate balance containers within a single business bank account. Each sub-account holds its own balance and is labeled for a specific purpose — such as taxes, payroll, or owner distributions — but they all live under one bank relationship, one login, and typically one account agreement. Funds transfer between them instantly without a wire or ACH delay.
Why do solopreneurs need sub-accounts instead of just one business checking account?
When all income lands in one account, it is easy to overspend money that is actually earmarked for quarterly taxes, upcoming invoices, or equipment purchases. Sub-accounts create a visual and functional separation so you never mistake available balance for spendable balance. It is the banking equivalent of the envelope budgeting method, applied to a business cash flow system.
How many sub-accounts do most solo operators need?
Most solos do well with four to six buckets: one operating account (daily expenses and vendor payments), one tax reserve, one owner pay or distributions account, one emergency or runway buffer, and optionally one per active project or revenue stream. The right tax reserve percentage depends on your entity type and situation — consult a CPA. Adding more than eight or ten sub-accounts tends to create administrative overhead without proportional benefit.
Is Relay the best business bank account for sub-accounts?
Relay is the most purpose-built option for envelope-style business banking among the major fintechs as of mid-2026. It offers up to 20 checking accounts and 50 virtual debit cards on its free tier, with no minimum balance and no monthly fee. That said, best depends on your workflow: if you want built-in tax withholding automation, Lili or Found may suit you better; if you need high-yield savings on idle cash, Mercury or Bluevine are worth comparing. Always verify current features and terms directly with the provider.
Are these fintech business bank accounts FDIC insured?
Most fintech business banking products use pass-through FDIC insurance through a partner bank, meaning your deposits may be insured up to applicable FDIC limits at the underlying bank. The exact structure, limits, and conditions vary by provider and can change. Always read the current account agreement and verify FDIC insurance status directly with the provider before depositing significant funds. Pass-through insurance is not identical to holding an account directly at an FDIC member bank.
Can I use sub-accounts to save for quarterly estimated taxes?
Yes, and this is one of the highest-leverage uses of the feature. A common approach is to auto-transfer a percentage of each deposit into a dedicated tax sub-account immediately upon receipt. The right withholding percentage depends on your net income, entity type, deductions, and state obligations — a CPA or tax professional can help you set an accurate rate. The account structure holds the money; it does not file or calculate your taxes for you.
What is the difference between sub-accounts and opening separate bank accounts at different banks?
Sub-accounts at one bank mean one login, one ACH relationship, instant internal transfers with no routing delay, and typically one monthly fee structure. Opening accounts at multiple banks means multiple logins, slower external transfers, possible duplicate monthly fees, and more reconciliation work in your accounting software. Sub-accounts win on simplicity; multiple banks can make sense when you need features — like higher-yield savings or a credit line — that one bank does not offer.
Do sub-accounts work with QuickBooks, Wave, or other accounting tools?
It depends on the provider. Relay has a direct QuickBooks Online and Xero integration, and each sub-account can be mapped as a separate chart-of-accounts entry. Mercury connects to QuickBooks and Xero as well. Lili and Found have lighter integrations — Found focuses on its own built-in bookkeeping. If your accounting workflow is central to your decision, verify current integration depth directly with the bank before signing up.
Is there a free business bank account with sub-accounts?
Yes. Relay's base plan is free with up to 20 checking sub-accounts and no minimum balance as of mid-2026 — verify current terms with Relay. Lili's base plan is also free with a Tax Bucket feature. Found offers a free tier with envelope-style tax savings. Mercury has no monthly fee and supports multiple accounts. Free tiers generally come with transaction limits or reduced features compared to paid plans.
What mistakes do solo operators make when setting up sub-accounts?
The most common mistakes are: setting up too many accounts and not maintaining them, failing to automate the transfer rules so buckets stay empty, not connecting sub-accounts to accounting software so reconciliation becomes manual, using sub-accounts as a substitute for actual bookkeeping (they track balances, not expense categories), and confusing a tax reserve sub-account with a complete tax strategy — the account holds money, but a CPA helps you calculate and file correctly.