Startup Compliance Calendar: Every Filing Deadline You Can't Miss

Startups don't just owe taxes once a year — compliance is a rolling calendar of federal, state, and payroll deadlines that apply whether or not you've raised money or generated revenue. Missing them can mean penalties, interest, administrative dissolution, or loss of good standing that can slow down a future fundraise or acquisition. This guide breaks the obligations down by category and by month so you can build a recurring compliance checklist.

Why do compliance deadlines matter even for pre-revenue startups?

Most founders assume taxes only matter once there's income, but entity-level obligations like Delaware franchise tax, state annual reports, and payroll filings (if you have any paid employees or founders on W-2) apply regardless of revenue. States can administratively dissolve a company for failing to file an annual report, which creates real problems during diligence for a fundraise or acquisition. Keeping a shared calendar — ideally with your CPA, attorney, and co-founders — prevents last-minute scrambles.

What are the core categories of startup compliance deadlines?

1. Entity-level state filings — Delaware franchise tax and annual report, foreign qualification renewals in states where you do business.
2. Federal income tax — corporate or pass-through return, estimated tax payments.
3. Payroll tax filings — Form 941 (quarterly), Form 940 (annual FUTA), state payroll filings.
4. Information returns — 1099-NEC for contractors, W-2 for employees, 1099-MISC/1099-DIV where applicable.
5. Equity and cap table filings — 83(b) elections (30-day window from grant), Form 3921/3922 for ISO/ESPP activity, Rule 701 and state blue sky filings for equity grants.
6. Sales tax and franchise/business license renewals — vary heavily by state and business model.

Month-by-month startup compliance calendar

This calendar reflects standard federal deadlines plus common startup obligations. Confirm exact dates each year since IRS deadlines shift slightly when they fall on a weekend or holiday, and always confirm state-specific dates with a CPA or registered agent.

Month	Deadline	What's due
January	Jan 15	Q4 estimated tax payment (prior year)
January	Jan 31	W-2s to employees and the SSA; 1099-NEC to contractors and the IRS
January	Jan 31	Form 941 for Q4 (if not deposited timely, Feb 10 extended deadline applies)
February	Feb 28/Mar 31	Paper/e-file deadline for 1099-MISC and other information returns not due Jan 31
March	Mar 1	Delaware franchise tax and annual report due for corporations
March	Mar 15	S-corp (Form 1120-S) and partnership (Form 1065) tax returns, or extension (Form 7004)
April	Apr 15	C-corp (Form 1120) and individual tax returns due, or extension (Form 4868/7004)
April	Apr 15	Q1 estimated tax payment
April	Apr 30	Form 941 for Q1
May	—	State annual report deadlines vary; check your state of incorporation and any foreign qualification states
June	Jun 15	Q2 estimated tax payment
June	Jun 1 (CA example)	Statement of Information due for California corporations (varies by incorporation anniversary)
July	Jul 31	Form 941 for Q2; Form 5500 for retirement plans (if applicable)
August	—	No major federal deadlines; good checkpoint for mid-year compliance review
September	Sep 15	Extended S-corp/partnership returns due; Q3 estimated tax payment
October	Oct 15	Extended C-corp and individual returns due
October	Oct 31	Form 941 for Q3
November	—	Year-end payroll and benefits review; confirm contractor W-9s on file before 1099 season
December	Dec 31	Last day for many equity grants, bonuses, or entity elections (e.g., S-corp election for next tax year generally due by Mar 15 of that year, but year-end planning starts now)

What happens if I miss the Delaware franchise tax deadline?

Delaware assesses a $200 late penalty plus 1.5% monthly interest on unpaid franchise tax, and continued non-payment can lead to the company losing good standing or eventually being administratively voided. Delaware franchise tax amounts depend on the calculation method used (Authorized Shares Method or Assumed Par Value Capital Method) — many early-stage startups with a high share count but low valuation should use the Assumed Par Value method to avoid an inflated bill, since the Authorized Shares Method can default to a much larger number.

How do payroll compliance deadlines work?

If you have any W-2 employees — including yourself, as explained in how to pay yourself as a founder — you're responsible for:

• Form 941, filed quarterly, reporting withheld federal income tax, Social Security, and Medicare taxes
• Form 940, filed annually (due January 31) for federal unemployment tax (FUTA)
• State withholding and unemployment filings, which vary by state and are often monthly or quarterly
• W-2s, due to employees and the Social Security Administration by January 31

Most startups use a payroll provider (Gusto, Rippling, Justworks, etc.) to automate these filings, which significantly reduces the risk of missing a deadline. For a deeper walkthrough of how these taxes are calculated, see how payroll taxes work for first-time founders.

What about estimated taxes?

Founders who take compensation outside of standard payroll withholding — LLC owners taking draws, or anyone with significant 1099 or investment income — typically need to make quarterly estimated tax payments by April 15, June 15, September 15, and January 15. Our quarterly estimated tax guide for founders walks through how to calculate safe-harbor payments to avoid underpayment penalties.

Building a compliance system that doesn't rely on memory

A few practices keep startups out of trouble:

• Use a registered agent service that forwards state compliance notices (most Delaware registered agents send franchise tax reminders).
• Keep a shared calendar (Google Calendar, Notion, or your cap table platform like Carta) with every recurring deadline and an owner assigned.
• Separate operating cash for tax and compliance obligations in a dedicated business bank account so payroll tax deposits and franchise tax payments don't compete with day-to-day burn.
• Loop in your CPA and startup attorney at least quarterly, not just at tax season, so equity filings (83(b), 409A valuations, Form 3921) aren't missed.
• Consider a treasury tool like Initio Treasury to track cash earmarked for upcoming tax and compliance obligations alongside operating funds.

Compliance deadlines rarely change dramatically year to year, but the consequences of missing them — penalties, lost good standing, or diligence red flags during a raise — compound quickly. Treat this calendar as a starting checklist and confirm specifics with a CPA or startup attorney familiar with your state and entity type.

What compliance deadlines apply specifically to equity and option grants?

Beyond tax and payroll filings, startups have a parallel set of equity-related compliance obligations that are easy to overlook:

• 83(b) elections: Must be filed with the IRS within 30 days of a restricted stock grant or early exercise — there is no extension, and missing it is irreversible.
• 409A valuations: Should be refreshed at least every 12 months, or sooner after a priced financing round, acquisition offer, or material change in the business, to maintain safe-harbor protection for option strike prices.
• Form 3921: Due to the IRS and to employees by January 31 following a year in which an incentive stock option (ISO) was exercised.
• Form 3922: Due similarly for transfers of stock under an employee stock purchase plan (ESPP).
• Rule 701 and state securities filings: Govern equity compensation issued to employees and consultants; thresholds and required notices vary by state and total value of securities issued in a 12-month period.

How should multi-state startups track compliance?

Once a startup has employees, contractors, or a registered office in more than one state, compliance multiplies quickly. Each state where you're "doing business" may require:

• Foreign qualification registration (separate from your state of incorporation)
• A state-specific annual report with its own due date and fee
• State payroll withholding and unemployment insurance registration for any W-2 employees located there
• Sales tax registration and filing, if you sell taxable goods or services into that state (economic nexus thresholds vary, often $100,000 in sales or 200 transactions annually)

A spreadsheet or compliance platform (such as Carta, Firstbase, or a dedicated registered agent service) that tracks each state's specific deadlines, fees, and required forms prevents a slow drift into non-compliance as the company grows into new markets.

What are the consequences of falling out of good standing?

Losing good standing — whether from a missed annual report, unpaid franchise tax, or lapsed registered agent — can have consequences well beyond the immediate penalty:

• Inability to obtain a certificate of good standing, which is often required to open bank accounts, secure financing, or close an acquisition
• Loss of the entity's name reservation in that state, allowing another company to claim it
• Personal liability exposure in some circumstances, since good standing supports the liability shield of the corporate structure
• Delays during fundraising due diligence, since investors' counsel routinely orders a good standing certificate as part of closing conditions

Reinstating a company that's fallen out of good standing is usually possible but requires paying back taxes, penalties, and reinstatement fees, which can add up to a meaningful unplanned expense.

Building a quarterly compliance review habit

Rather than treating compliance as a once-a-year scramble, many startups build a recurring quarterly review into their finance operating rhythm:

1. Confirm all payroll tax deposits and Form 941 filings are current
2. Reconcile contractor payments to ensure accurate 1099-NEC reporting at year-end
3. Review cap table activity for any 83(b) elections, option exercises, or 409A triggers
4. Check franchise tax and annual report status in every state of qualification
5. Confirm business licenses, sales tax permits, and registered agent service are current

This quarterly rhythm, paired with an annual CPA and attorney check-in, catches most issues well before a deadline becomes a penalty.