Set up your back office in a week
A week, in order: the EIN, the bank, the books, payroll, bills and invoices, the calendar and the records. Then a monthly close from the first month.
Everything in Core can be set up in the company's first week, before the first hire and before the first invoice. Done in order, each day's work is what the next day needs. Northwind did it this way in the first week of September.
Step 1: Day 1: the number
Apply for the EIN on IRS.gov, confirm the registered agent and decide the fiscal year. Done when the EIN notice is saved with the certificate of incorporation. Deeper: the entity and its numbers and choosing an entity.
Step 2: Day 2: the money
Open the business checking account and the company cards, and fund it with the founders' shares. Done when the founders' $60,000 is in the company account and JE-1 is the first entry. Deeper: company money, kept apart, and founder stock and vesting for the shares themselves, with the 83(b) election due within 30 days.
Step 3: Day 3: the books
Set up the accounting system on the accrual basis, with a chart of accounts and the bank and card feeds. Done when yesterday's transactions are in the ledger, coded. Deeper: the books, in one lesson and the chart of accounts.
Step 4: Day 4: the people
Choose a payroll provider or a PEO and register for state payroll accounts wherever employees will work. Done when the first payday is scheduled and each hire has a W-4 and an I-9 ready. Deeper: hiring your first employee, payroll providers and PEOs and health insurance.
Step 5: Day 5: bills and invoices
Write down who approves bills and who pays them, collect a W-9 from every vendor and make the invoice template. Done when no bill can be paid by the person who approved it. Deeper: vendor onboarding and how to write an invoice.
Step 6: Day 6: the calendar
Put the year's deadlines in a shared calendar, worked out from the rules. Done when each date has an owner and a reminder two weeks ahead. Deeper: the founder's annual calendar and the compliance calendar.
Step 7: Day 7: the records
Make one place for records: the certificate, the EIN notice, minutes, contracts, and receipts attached to transactions. Done when anyone can find any document from the books in a minute. Deeper: keeping the records.
Two habits carry most of the weight. Keep company money in company accounts, so the bank feed is the whole story and there's no commingling to untangle. Split the work, so the person who approves a payment isn't the one who releases it. Even two founders can keep segregation of duties that way, and it's the first control a diligence team asks about.
Wrong
Use the founder's card for now, keep a spreadsheet, and hire someone to clean it up before the seed round.
Right
A week of setup, then a monthly close from the first month, with books that are reconciled and signed off.
Back-office debt compounds. Six months of unreconciled transactions take longer to fix than six months of doing it right, and the fix usually lands in the middle of a fundraise.
Set it up in the first week, in order: the number, the money, the books, the people, the bills and invoices, the calendar, the records. Then close every month.
That's the map. The tracks after Core each take one road on it, taught on the same company and the same month: Entity types for what the company is, Accounting for the books, Finance for the cash ahead, Cap tables & raising for who owns it, Payroll, AP and AR for the money moving, Compliance & tax for the filings, Health & benefits for the plans, and the R&D tax credit for what a startup's research can earn back.
Where this lesson's rules come from
The sources behind this lesson's requirements, by kind. Anything marked as a convention is ours, not the rule-maker's.
- IRS guidance
- IRS, Get an employer identification number (opens in a new tab)Apply for an EIN online, free, from the IRSFree to read
- IRS Pub. 583 (12/2024), Recording Business Transactions — Business checkbook (opens in a new tab)Open a business account, and keep it separateFree to read
- Official form
- Form W-4 (2026) (opens in a new tab)Form W-4, Employee's Withholding CertificatePDF · Free to read
- USCIS Form I-9 (Edition 01/20/25), Sections 1 and 2 (opens in a new tab)Form I-9, Employment Eligibility VerificationPDF · Free to read
- Form W-9 (Rev. 3-2024) (opens in a new tab)Form W-9, Request for Taxpayer Identification Number and CertificationPDF · Free to read
The words this lesson teaches
Each links to its glossary definition, which also names the authority behind it and the components that render it.
- ComminglingRunning company and personal money through the same account or card, so the books can no longer show whose a transaction was. The fix is a separate business account and a recorded entry — a reimbursement, a loan from the founder or a contribution — for every crossing
- Segregation of dutiesSplitting authorization, recording, custody of assets and reconciliation across different people, so no one person can both commit and conceal an error or fraud — at minimum, preparer ≠ approver
- Chart of accountsThe account structureConvention
- CloseThe process of finalizing a periodConvention
- ReconciliationComparing our record to an external party's
In the founder glossary
This lesson’s ideas, explained for the founder running the company. Each has an entry in the founder glossary.
See also
- Why startups should close their books every monthA monthly close turns a bank balance into numbers an investor, an auditor or a 409A firm will accept. What it is, and why it gets expensive to skip.
- Chart of accounts for startups: a starting templateA starting chart of accounts for a US startup: number ranges, the expense accounts you need, and when to add an account versus a class or tracking tag.
- Company cards and receipts: coding, matching, reconcilingCompany cards without the month-end receipt chase: how to code card spend, match receipts, handle missing ones and reconcile the card to its statement.
- Accounts payable process for startups: intake to paymentHow a bill moves from inbox to paid: intake, coding, approval, scheduling and recording, plus AP aging and who approves what at a 10-person startup.
- First-year compliance calendar for a Delaware C-corpDelaware franchise tax, 1099s, the federal return, payroll filings, state annual reports and sales tax: the deadlines a young C-corp misses most, by month.
- Audit-ready books before your Series AInvestors, lenders and auditors ask for the same things: accrual statements, reconciled accounts and support for every balance. How to be ready first.