How to Count Business Days for Tax Filing Deadlines

When a tax deadline lands on a weekend or a public holiday, what happens next depends on the tax authority, and the answer is not always "the next business day". In the United States a statute moves most federal deadlines forward. In the United Kingdom HMRC's deadlines stay where they are, and a VAT payment has to reach HMRC by the deadline even when it falls on a weekend. Here is how each works, with the source for each rule listed at the end of the guide.

United States: IRC Section 7503

Section 7503 of the Internal Revenue Code is the controlling statute for federal tax deadlines. It reads, in part: "When the last day prescribed under authority of the internal revenue laws for performing any act falls on Saturday, Sunday, or a legal holiday, the performance of such act shall be considered timely if it is performed on the next succeeding day which is not a Saturday, Sunday, or a legal holiday."

The same section defines "legal holiday" as a legal holiday in the District of Columbia. For a return or other act due at an IRS office outside the District, it also counts a statewide legal holiday in the state where that office is located. The District's legal holidays include District of Columbia Emancipation Day on 16 April, which moves to the Friday before when it falls on a Saturday and to the Monday after when it falls on a Sunday. That is why the individual filing deadline sometimes lands on 17 or 18 April instead of 15 April: a weekend 15 April moves to the Monday, and when Emancipation Day is observed on that Monday, the deadline moves again. In 2022 the IRS set the deadline at April 18, and taxpayers in Maine and Massachusetts had until April 19 because of the Patriots' Day holiday in those states.

The rule covers estimated tax too. IRS Publication 509 puts the instalments on the 15th day of the 4th, 6th and 9th months of the tax year and the 15th day of the month after it ends (15 April, 15 June, 15 September and 15 January for a calendar year), and states that a due date falling on a Saturday, Sunday or legal holiday moves to the next day that is none of those. The automatic six-month extension for Form 1040 moves the filing date to 15 October for a calendar-year return, and that date rolls forward in the same way.

United Kingdom: HMRC Deadlines Stay Put

HMRC's deadlines do not roll forward to the next working day. Each one is a fixed date, and the guidance for each says what happens when it lands on a weekend.

Self Assessment is the clearest case. The online return is due by 31 January and a paper return by 31 October. In 2026, when 31 January fell on a Saturday, HMRC's press release said "This year's deadline falls on a Saturday" and offered webchat and phone support on Saturday 31 January. A return filed on the Monday after is filed after the deadline, and the late-filing penalties start with an initial £100 fixed penalty.

VAT runs the other way from the US rule. A return and its payment are usually due one calendar month and 7 days after the end of the accounting period, and HMRC's guidance says you must submit the return and make sure the payment reaches HMRC on or before the deadline, even if it is on a weekend or bank holiday. So a payment has to leave early enough to arrive: HMRC says Bacs payments usually take 3 working days, while Faster Payments usually reach HMRC on the same or next day, weekends and bank holidays included.

PAYE under Real Time Information has its own rule. A Full Payment Submission (FPS) goes to HMRC on or before your employees' payday. If you pay early because the usual payday falls on a bank holiday, HMRC's guidance says the FPS should still show the regular payday.

India and the Philippines

For advance tax in India, the Central Board of Direct Taxes clarified in Circular No. 676 of 14 January 1994, applying section 10 of the General Clauses Act, 1897, that when the last day for paying an instalment is a day on which the receiving bank is closed, the assessee can pay on the next working day, and the interest under sections 234B and 234C of the Income-tax Act, 1961 is not charged. This guide does not yet cover the rule for filing an Indian return, how either rule applies under the Income-tax Act, 2025, or how the Philippine Bureau of Internal Revenue treats a deadline that falls on a weekend or holiday; we will add each once it can be cited to the instrument that sets it. The calculators for India and the Philippines count business days on each country's holiday calendar, which is the count to use once you know the rule that applies.

Practical workflow

For US filers, the US Business Day Calculator and the Add Business Days tool count on the federal holiday calendar. That calendar does not include Emancipation Day or any state holiday, so check a mid-April deadline against Section 7503 rather than the count alone.

For UK filers, work backwards from the HMRC date. The Subtract Business Days tool, set to the UK, gives the last working day a Bacs payment can leave to reach HMRC by a VAT deadline, counting the bank holidays in England and Wales.

For more on how due dates roll forward across holidays in commercial contracts, see the guide on payment due dates that fall on weekends or holidays.

FAQ

If April 15 falls on a Sunday, when is the federal tax deadline?

The next day that is neither a weekend day nor a legal holiday in the District of Columbia, under IRC Section 7503. That would be Monday, April 16, but 16 April is District of Columbia Emancipation Day, so the deadline moves to Tuesday, April 17.

Does the IRS extend the deadline if April 15 falls on a state holiday in my state?

It can. Section 7503 also counts a statewide legal holiday in the state where the IRS office you file with is located. In 2022 the IRS gave taxpayers in Maine and Massachusetts until April 19, a day after the April 18 deadline elsewhere, because of the Patriots' Day holiday in those states.

How does HMRC handle weekend deadlines?

It does not move them. The Self Assessment online deadline is 31 January even when that is a Saturday or Sunday: in 2026, when it fell on a Saturday, HMRC kept the date and staffed webchat and phone support that day. VAT returns and payments must reach HMRC on or before the deadline, even if it is on a weekend or bank holiday.

What about VAT and PAYE deadlines?

A VAT return and its payment are usually due one calendar month and 7 days after the end of the accounting period, and the deadline does not move off a weekend or bank holiday, so allow for the payment to reach HMRC: Bacs usually takes 3 working days. A PAYE Full Payment Submission is due on or before payday; if you pay early because payday falls on a bank holiday, the FPS still shows the regular payday.