Which Quarter Does Income Count In for Estimated Taxes?
October 2026
If you use the cash method, as most freelancers and sole proprietors do, income counts in the estimated tax period when you receive it, not when you send the invoice or do the work. An invoice sent in March and paid in April is April income, so it belongs to the second period (April 1 – May 31, paid by June 15). Under the regular method, though, that timing changes less than you'd think.
Key Takeaways
- Cash method: income counts when you receive it, or when it's credited to you and available to use.
- An unpaid invoice is not income yet. It counts in the period the client pays.
- Payments through Stripe, PayPal or a platform count when they land in that account, not when you move the money to your bank.
- The accrual method counts income when it's earned, so a March invoice is March income regardless of when it's paid.
- With the regular method, each payment is 25% of your annual target anyway. Timing matters most for the annualized method, for year-end, and for how much cash to set aside.
The Rule: Cash Method vs. Accrual Method
Your accounting method decides which period income belongs to. Most self-employed people use the cash method because it's simpler and matches their bank balance.
| Situation | Cash Method | Accrual Method |
|---|---|---|
| Invoice sent March 20, paid April 5 | April income → 2nd period (due June 15) | March income → 1st period (due April 15) |
| Work finished in May, invoice still unpaid on June 15 | Not income yet. Counts when paid | May income → 2nd period |
| Client pays via Stripe on August 30, you transfer to your bank September 3 | August income → 3rd period (due September 15) | When earned |
| Check handed to you December 30, deposited January 4 | December income → this tax year | When earned |
| Client mails a check December 31, it arrives January 3 | January income → next tax year | When earned |
| Retainer or deposit paid upfront in May for work in July | May income → 2nd period | Generally when received, though the unearned part can be deferred to the next tax year |
The key idea under the cash method is constructive receipt: money counts as received once it's credited to you or made available without restriction, even if you haven't deposited it. A check in your hand or a balance sitting in your PayPal account is received. A check still in the mail is not. Deliberately not cashing a check doesn't push the income into a later period.
Which Period Is "Q2" or "Q3" for Estimated Taxes?
The IRS estimated tax periods are uneven, which trips up a lot of timing questions:
- 1st period: January 1 – March 31, due April 15
- 2nd period: April 1 – May 31, due June 15
- 3rd period: June 1 – August 31, due September 15
- 4th period: September 1 – December 31, due January 15 of the next year
So a payment received June 3 is third-period income, even though June is in the calendar second quarter. Our guide to estimated tax payment periods explains why the periods are uneven.
When the Timing Actually Changes What You Pay
Under the regular method, each installment is 25% of your required annual payment: 90% of this year's tax, or 100% or 110% of last year's under the safe harbor rule. Moving an April payment into the first period wouldn't change the required amount for either one. Timing matters in three places:
- The annualized income installment method. If your income is uneven and you use Form 2210 Schedule AI, each installment is based on income received by the end of that period. Here, an April payment really does belong to the second period, and recording it correctly can lower what you owed earlier.
- Year-end. Income received December 31 is taxed this year; income received January 2 is taxed next year. That's the timing that changes your total tax, not just your installments.
- Cash planning. If you set aside a percentage of every payment as it arrives (see the Safe-to-Spend method), receipt dates decide which deadline that cash is earmarked for.
When Your 1099 Doesn't Match Your Records
Clients report payments on Form 1099-NEC for the year they paid you. If a client mailed a check on December 31 that you received in January, their 1099 may include it in the earlier year while your cash records put it in the later one. Keep the envelope date or deposit record, report the income in the year you received it, and keep a note explaining the difference. Payment processors report Form 1099-K by transaction date, which usually matches the cash method because the money is received when it lands in your processor account.
Expenses Follow the Same Rule
Under the cash method, expenses count when you pay them. A business purchase charged to a credit card counts on the charge date, even if you pay the card bill the next month. A bill you received but haven't paid isn't deductible yet.
Let your books decide the period, not your memory.
Numeris Ledger imports your bank and payment-platform transactions on the date they're received, categorizes them, and assigns income to the right estimated tax period automatically, so you always know what's due and when.
Start your free 7-day trialFrequently Asked Questions
I invoiced in March but got paid in April. Is that Q1 or Q2 income?
Under the cash method, it's April income, so it belongs to the second estimated tax period (April 1 to May 31, due June 15). Under the accrual method, it's March income for the first period. Most freelancers and sole proprietors use the cash method.
My Q2 payment is due but an invoice is still open. Do I include it?
No, not under the cash method. An unpaid invoice isn't income yet. It counts in whichever period the client actually pays you. Include it in your estimate for that later period, and set money aside as soon as it arrives.
Does PayPal or Stripe income count when I withdraw it?
No. It counts when the payment lands in your PayPal, Stripe or platform account and is available to you, not when you transfer it to your bank. Money credited to an account you control is constructively received, even if you leave it there. Numeris Ledger imports platform payments on the date they're credited, so each lands in the right period.
Can I wait to deposit a check to push income into next year?
No. Once a check is in your hands, it's received under the constructive receipt rule, whether or not you deposit it. What does change the year is when the client actually pays: a check that arrives in January is January income, even if it was mailed in December.
Do I pay estimated tax based on the income in each quarter?
Under the regular method, no. Each payment is 25% of your required annual payment, whenever the income arrived. Only the annualized income installment method (Form 2210, Schedule AI) ties each payment to the income actually received by the end of that period.
Which accounting method am I using?
Check Schedule C, line F, on your last return: it shows cash, accrual or other. If you've never chosen and you record income when money arrives, you're on the cash method. Changing methods later generally needs IRS consent on Form 3115, so talk to our CPA before switching.
Tax information in this post is for general educational purposes only and does not constitute tax or legal advice. Consult our CPA for guidance specific to your situation.