The 2026 Startup Accounting Playbook for First-Time Founders

Startup accounting problems are rarely caused by bad decisions. They are caused by late ones. A founder opens a bank account, signs a few contractors, accepts a first investment, and only months later asks how the books should have been kept. This startup accounting playbook walks first-time founders through the US accounting and compliance decisions that matter in 2026, in the order they usually arise. It is written for founders based in the United States and for founders based elsewhere who are forming or running a US company, most often a Delaware C-Corporation.

Currency of this guide: the figures and deadlines below reflect law and published guidance as of October 2026. Tax rules change, so confirm current requirements before you act.

1. Lay the Foundation: Entity, EIN and Ownership Reporting

1.1 Choose the entity with your funding plan in mind

Founders who plan to raise angel or venture capital commonly form a Delaware C-Corporation. One reason with a direct tax impact is Qualified Small Business Stock under Section 1202, which applies only to stock issued by a domestic C-corporation (see Section 8). LLCs and S-Corporations suit other situations, and the right answer depends on your funding plans and on each founder’s personal tax position. Decide this with an adviser before you incorporate, because changing later is costly.

1.2 Obtain your Employer Identification Number (EIN)

Your EIN, issued by the IRS, is needed to open a bank account, run payroll and file tax returns. Founders who do not hold a US Social Security number follow a different application route, so allow extra lead time. The IRS explains the process on its EIN application page.

1.3 Know your Delaware annual obligations

Delaware corporations file an annual report and pay franchise tax by March 1 each year to stay in good standing. The minimum franchise tax is $175 under the Authorized Shares method and $400 under the Assumed Par Value Capital method. The two methods can produce very different amounts for a startup with many authorized shares, so calculate under both before paying. The annual report filing fee is $50 for a non-exempt domestic corporation. Official details are on the Delaware Division of Corporations website.

1.4 Beneficial ownership reporting in 2026

Under FinCEN’s final rule, effective August 14, 2026, entities formed in the United States are exempt from beneficial ownership information (BOI) reporting under the Corporate Transparency Act, and US persons are not required to provide their information to reporting companies. Entities formed under foreign law and registered to do business in the US remain within the reporting framework, so founders who operate through a foreign parent should confirm their status. FinCEN publishes current guidance on its BOI page.

2. Build the Financial Foundation

2.1 Separate business and personal finances from day one

Open a dedicated business bank account and route every founder contribution, loan and reimbursement through it with supporting documents. Clean records here protect the company’s limited liability story, simplify diligence, and, for foreign-owned companies, feed directly into the related-party reporting described in Section 4.

2.2 Keep accrual-basis books aligned to US GAAP

Investors, lenders and auditors expect accrual-basis financial statements prepared under US GAAP. Settle three policies early: revenue recognition (ASC 606), stock-based compensation (ASC 718) and your capitalization threshold for equipment and software. Your tax return may use different methods from your financial statements, so keep a simple reconciliation between the two each year.

2.3 Design a chart of accounts that answers investor questions

A good chart of accounts is built around the questions a future investor will ask. At a minimum:

• Revenue split by stream, with cost of revenue shown separately so gross margin is visible.
• Operating expenses grouped into research and development, sales and marketing, and general and administrative.
• Dedicated accounts for founder loans, equity, deferred revenue, payroll liabilities and sales tax payable.
• Separate accounts or classes for pre-launch start-up costs and organizational costs (see Section 7).

2.4 Choose your software and set a monthly close

QuickBooks Online and Xero both serve early-stage companies well. The tool matters less than the routine: reconcile bank, card and payment-processor accounts every month, review receivables and payables, record accruals, and lock closed periods. Marcken Solutions explains these habits in Building Audit-Ready Books in QuickBooks and Xero.

3. Master Your Federal Compliance Calendar

The calendar below assumes a calendar-year C-Corporation. Fiscal-year companies, short first years and weekends or holidays shift some dates, so treat it as a starting point and confirm yours.

Date	Obligation	Notes
Within 30 days of a stock transfer	Section 83(b) election for unvested stock	See Section 8.
January 31	Forms W-2 to employees and Forms 1099-NEC to contractors	Contractor forms apply above the reporting threshold in Section 5.
Quarterly	Form 941 payroll tax return	Required when you run payroll.
March 1	Delaware annual report and franchise tax	Applies to Delaware corporations.
April 15	Form 1120, or Form 7004 to request an extension; Form 5472 where it applies	Any tax due is still payable on April 15 even if you extend.
April 15, June 15, September 15, December 15	Corporate estimated tax installments	Due on the 15th day of the 4th, 6th, 9th and 12th months of the tax year.
October 15	Extended Form 1120 deadline	Applies if Form 7004 was filed on time.

The IRS Instructions for Form 1120 set out the due-date and extension rules in full. For the filing-season routine behind these dates, see Preparing for the Next US Filing Season and Form 1120 Review Controls.

4. Foreign-Owned? Plan for Form 5472

This section matters most for companies with foreign owners, because the penalties are fixed and large. If you are a US-based founder and every owner is a US person, Form 5472 generally does not apply to you. It can apply as soon as a foreign investor or co-founder holds 25 percent or more, so it is worth understanding early.

• Who files: US corporations that are 25 percent or more foreign-owned, and foreign-owned US disregarded entities such as single-member LLCs.
• What it reports: reportable transactions between the company and its related parties, including the foreign owner. Typical examples are capital contributions, shareholder loans and payments between the founder and the company.
• When: with the company’s income tax return (a pro forma Form 1120 for a foreign-owned disregarded entity), on the same due date including extensions. A timely Form 7004 extends the Form 5472 along with the return.
• Penalty: $25,000 per form per year for failing to file, filing late or filing a substantially incomplete form. If the failure continues more than 90 days after IRS notification, a further $25,000 applies for each 30-day period.

The practical answer is bookkeeping discipline: tag every transaction with the foreign owner or any related party as it happens, so the annual form is a report of records that already exist rather than a reconstruction. Primary reference: IRS, About Form 5472.

5. Pay People Correctly

5.1 Employees and contractors

Worker classification turns on the real working relationship, not on the label in the contract. The IRS looks at behavioral control, financial control and the relationship of the parties. Founders who work in the corporation and are paid by it are generally treated as employees for payroll purposes, so plan to run payroll rather than paying founders by transfer.

5.2 The 2026 Form 1099 threshold

For payments made after December 31, 2025, the Form 1099-NEC and Form 1099-MISC reporting threshold rose from $600 to $2,000 under the One Big Beautiful Bill Act, and it is indexed for inflation from 2027. The threshold changes who receives a form, not what is deductible or taxable, and some states keep their own rules. Collect a Form W-9 from US payees, or the appropriate Form W-8 from foreign payees, before the first payment. Payments to non-US contractors can carry different reporting and withholding consequences, so review them before you pay.

6. Understand Sales Tax Nexus Early

Since the US Supreme Court’s 2018 decision in South Dakota v. Wayfair, a state can require an out-of-state seller to collect sales tax based on economic activity in the state, even without a physical presence. A common threshold is $100,000 in sales into the state. Some states also or alternatively count 200 transactions, although a growing number have dropped the transaction test. Marketplace sales count toward the threshold in some states and not in others.

Two practical steps keep this manageable. First, record sales by ship-to or customer state every month. Second, confirm how each relevant state taxes your product, because the treatment of software and digital services varies by state.

7. Treat Start-Up Costs and R&D Correctly

7.1 Pre-launch and organizational costs

Under Section 195, a business may deduct up to $5,000 of start-up costs in the year it begins operating. That amount is reduced dollar for dollar once total start-up costs exceed $50,000, and falls to zero at $55,000. Whatever is not deducted immediately is amortized over 180 months. Organizational costs of a corporation follow a parallel rule of their own. Record these costs in separate accounts from the first day. The Congressional Research Service summarizes the rule in its Section 195 overview.

7.2 Research and experimental expenditures

New Section 174A, enacted in the One Big Beautiful Bill Act, restores an immediate deduction for domestic research and experimental expenditures paid or incurred in tax years beginning after December 31, 2024. Research performed outside the United States is still capitalized and amortized over 15 years. For founders who use offshore developers or contract researchers, this makes it valuable to record where research work is performed, by whom and at what cost. Founders building software or hardware should also review which of their costs qualify.

8. Handle Equity Decisions with Care

8.1 The Section 83(b) election

Founders who receive stock that vests over time may elect to include its value in income at transfer rather than at vesting. The election must be filed within 30 days of the transfer, using IRS Form 15620 or a compliant written statement, and a copy goes to the company. The deadline cannot be extended, and the election generally cannot be revoked without IRS consent. It applies to restricted stock and early-exercised options, not to restricted stock units. See IRS Form 15620.

8.2 Qualified Small Business Stock (Section 1202)

For stock issued after July 4, 2025, the One Big Beautiful Bill Act introduced a tiered federal gain exclusion for qualified small business stock:

Holding period	Gain exclusion	Other changes for post-July 4, 2025 stock
3 years	50 percent	Gross assets limit raised to $75 million
4 years	75 percent	Per-issuer cap is the greater of $15 million or 10 times basis
5 years or more	100 percent	Limits indexed for inflation from 2027

The company must be a domestic C-corporation and meet other conditions, including an active qualified business. State treatment of the exclusion varies. Keep the cap table, issue dates and asset records current, because they are the evidence for any future claim.

8.3 Support option grants with a defensible valuation

If you plan to grant stock options to employees, support the exercise price with a documented fair market value valuation. Raise this with your adviser before the first grant, not after.

9. Prepare Investor-Ready Financials

Diligence rewards companies whose records are already organized. A founder who has followed the steps above can assemble the following without a scramble:

• Monthly income statement, balance sheet and cash flow statement, with a documented close.
• A cap table reconciled to the equity accounts in the ledger.
• Key metrics: monthly burn, runway, gross margin and deferred revenue.
• Filed returns, Delaware good-standing evidence and, if foreign-owned, Form 5472 workpapers.
• Payroll records, contractor agreements with W-9 or W-8 forms, and sales tax registrations.

10. Five Costly Mistakes and How to Avoid Them

Mistake	What it can cost	How to avoid it
Missing Form 5472 (foreign-owned companies)	$25,000 per form, per year, plus a further $25,000 for each 30-day period that the failure continues more than 90 days after IRS notification	Tag related-party transactions through the year and calendar the form with the Form 1120
Missing the Section 83(b) deadline	The election is not available after the 30-day window	File within 30 days of each stock transfer and keep proof of filing
Mixing personal and business money	Weak records for diligence, tax filings and related-party reporting	Use a dedicated business bank account from day one
Paying contractors without a W-9 or W-8	Missing information for 1099 reporting and for review of foreign payments	Collect the form before the first payment
Overlooking the Delaware March 1 deadline	The annual report and franchise tax are due March 1 each year	Calendar the date and compare both franchise tax methods

11. The First-Time Founder’s Checklist

1. Form the entity with your funding plan in mind, and obtain the EIN.
2. Open a dedicated business bank account and keep personal finances out of it.
3. Set up accrual-basis books under US GAAP with a chart of accounts built for investors.
4. Calendar the Delaware March 1 filing and review the franchise tax method.
5. If foreign-owned, tag related-party transactions throughout the year and plan the Form 5472.
6. File the Section 83(b) election within 30 days of any unvested stock transfer.
7. Run payroll for founders and employees, and collect W-9 or W-8 forms before paying contractors.
8. Track sales by state and review sales tax nexus each month.
9. Keep start-up costs, organizational costs and R&D costs in separate accounts, and record where research is performed.
10. Close the books monthly and reconcile the cap table to the ledger.
11. Calendar the April 15 Form 1120 deadline and decide early whether to extend with Form 7004.
12. Review the plan with a US tax and accounting adviser at least once a year.

12. How Marcken Solutions Supports Founders

Marcken Solutions provides quiet, dependable support engagements tailored to the workflows of US firms and businesses. For founders, support maps to the decisions in this playbook:

Where founders need support	How Marcken Solutions supports
Clean monthly books	Bookkeeping Support: accurate ledger maintenance and reconciliations across modern platforms, including QuickBooks and Xero.
US tax compliance and the Form 1120	Return Preparation Support and Compliance-Related Support: structured preparation and review that keeps filings on standard and on time.
Foreign-owned company reporting	Related-party transaction tracking and Form 5472 support for foreign-owned US companies.
Investor-ready records	Financial Documentation Support and Business Reporting Support: audit-ready documentation aligned to US standards and clean management reporting.
Day-to-day tax and accounting questions	Tax and Accounting Support across planning, preparation workflows and accounting cycles.

Why founders choose Marcken Solutions

• US taxation led by CA Radhika Chandak, FCA, Director, US Taxation, who is pursuing CPA (US) and CMA, with 7+ years of experience across US and Australian taxation, accounting and advisory.
• Experience with Forms 1040, 1065, 1120, 1120S and 1041, Form 8825, Section 163(j), depreciation, R&D and energy tax credits, international tax and transfer pricing.
• Prior experience at Citrin Cooperman India LLP (US federal and state tax) and Manubhai & Shah LLP (Australian SMSF and BAS).
• Bookkeeping support across QuickBooks and Xero for clients supporting US tax compliance.
• Every enquiry handled in confidence, with a response within one business day during office hours.

Explore the full range on the Services page or meet the team on the Our Team page.

13. Frequently Asked Questions

Do I have to form a Delaware C-Corporation?

No. It is a common choice for founders who plan to raise venture or angel capital, but LLCs and S-Corporations suit other plans. Choose based on your funding plan and each founder’s tax position.

Do I file a US tax return if my company has no revenue?

Domestic corporations generally must file an income tax return whether or not they have taxable income. A foreign-owned company with reportable transactions may also need Form 5472.

When is Form 5472 due?

With the company’s income tax return, including extensions. For a calendar-year company, that is April 15, or October 15 if Form 7004 is filed on time.

What is the 2026 Form 1099-NEC threshold?

$2,000 for payments made after December 31, 2025, indexed for inflation from 2027. Some states maintain their own rules.

14. Conclusion

Good startup accounting is a set of small habits begun early: separate finances, a monthly close, a tax calendar, and records that tell the story of every dollar between founder and company. Founders who build these habits in year one spend their time on the product and the customer, not on remediation.

Disclaimer: this article offers general information for educational purposes and is not tax, legal or accounting advice. Rules vary with each company’s facts and change over time. Consult a qualified adviser before acting.

Sources

1. IRS, About Form 5472
2. IRS, Instructions for Form 1120
3. IRS, Form 15620, Section 83(b) Election
4. IRS, Apply for an Employer Identification Number
5. FinCEN, Beneficial Ownership Information Reporting
6. Delaware Division of Corporations, Annual Reports and Franchise Tax
7. Congressional Research Service, Section 195 start-up costs
8. Supreme Court of the United States, South Dakota v. Wayfair, Inc. (2018)