Standard vs Calendar Quarters in MTD: Which Should You Choose?

Making Tax Digital for Income Tax gives you a choice most people never notice they are making. Your quarterly updates can follow the tax year, ending on the 5th of July, October, January and April. Or they can follow the calendar, ending on 30 June, 30 September, 31 December and 31 March.

The deadlines are identical either way. The amount you pay is identical either way. What changes is how much fiddling you do to line your own records up with HMRC's periods, and for anyone whose bookkeeping already runs to month end, the difference is real.

There is a catch worth knowing before you get attached to the idea: 21 of the 122 products on HMRC's directory cannot do calendar quarters at all, and you have to make the election before your first update of the tax year.

The two options, precisely

Every product on HMRC's directory supports standard update periods. They are the default, and if you do nothing this is what you get.

HMRC lists what each vendor declares. Feature flags, mobile-app support in particular, are vendor claims rather than verified facts, and listings change. Check with the vendor before you buy. Data: HMRC find-MTD-software service (tax.service.gov.uk), scraped 5 August 2026.

Because quarterly updates under MTD are cumulative, HMRC expresses the periods as running from the start of the tax year each time rather than as three-month blocks. That is why the table below reads the way it does.

Two things follow from that table that surprise people.

The deadlines do not move. Choosing calendar quarters does not buy you extra time, and it does not cost you any. A calendar first quarter ends five days earlier than a standard one and is still due on 7 August.

Each update restates the year to date. Your second update is not "July to September". It is "the year so far", with the second quarter's figures included. Correcting an earlier mistake is therefore a matter of restating the cumulative total in the next update rather than amending the old one.

Why calendar quarters exist

The tax year's 5 April boundary is a historical accident that nothing else in your financial life respects. Your bank statements run to month end. Your accounting software closes months. Your invoices, rent and direct debits fall on calendar months. Your VAT quarters, if you are registered, end on month ends too.

Under standard periods, that mismatch has to be resolved four times a year. The rent received on 2 July belongs in the first quarter under standard periods and the second under calendar periods. Multiply that by every transaction in the first week of July, October, January and April, and the tidying is not nothing.

HMRC's fix was to let you elect calendar periods and to treat a 1 April to 31 March accounting period as equivalent to the tax year. In practice that means you can stop adjusting for the five days entirely.

When to choose calendar quarters

Calendar periods are usually the better choice if any of these describe you:

You already close your books monthly. If your records are month-end clean, calendar quarters mean your MTD figures are the numbers you already have, with no cut-off work.

Your income arrives on month boundaries. Landlords are the clearest case. Rent is almost always due on a fixed day of the month, and a tenancy that pays on the 1st sits awkwardly against a 5 July cut-off.

You are VAT registered on calendar quarters. Aligning both regimes to the same period ends means one reconciliation, not two.

Your accountant asks for it. Many practices standardise on calendar periods across their client base for exactly the reasons above.

When to stay on standard quarters

Your software cannot do calendar periods. Twenty-one listed products cannot, and it is not worth changing product for this alone if the rest of the fit is good.

You are already mid-tax-year on standard periods. You cannot switch for the current year once you have submitted a quarterly update, so this decision waits until next year.

Your final declaration figures are tax-year exact. Whichever periods you use for updates, the annual figures still have to reflect the tax year. If your business has a genuine 5 April cut-off in its own records, the calendar election adds an extra reconciliation instead of removing one.

You genuinely do not care. This is a legitimate answer. The difference is a handful of days of bookkeeping tidiness, not a tax outcome. If the choice is not obviously worth making, take the default.

How and when you elect

Three rules from HMRC's own service guidance, and each one catches people out.

You elect in your software, not on GOV.UK. Your product calls HMRC's endpoint to set the quarterly period type. There is no separate form and no letter to write. If your software does not surface the option, you cannot make the election.

You must do it before your first quarterly update of the tax year. HMRC is unambiguous: after submitting the first quarterly update for a tax year, you cannot change the quarters for that year. If you are reading this in September having already filed in August, your decision is for next April.

The election is per business and it persists. It applies to a business rather than sweeping across everything you own, and it carries on year after year until you ask to change back. If you have a trade and a rental property, check what your software has set for each.

One transitional detail if you are electing for the first time: HMRC's guidance notes that for customers who elected calendar quarters from April 2025, the first quarterly period runs from 6 April to 30 June rather than 1 April to 30 June. The tax year still begins when it begins.

The 21 products that cannot do calendar quarters

If calendar periods matter to you, this is the list to check your shortlist against. As graded on 5 August 2026, these products are the ones marked not included for calendar update periods. HMRC grades this feature pass or fail, so the directory cannot tell you whether any of them is working on it, and the vendor is the only source for that.

A few observations on that group.

Kletta is the notable name. It is one of the most complete products on the directory, graded ready on 15 of the 16 return items, mobile-first on iOS and Android, and it does not support calendar periods. Its list pricing is £19 a month for the sole-trade plan and £29 a month for the plan including property, with heavy on-site promotional discounting, as of August 2026.

Starling is the notable bank. It is the only one of the free bank MTD tools without calendar periods, and it is the least likely limitation for a bank tool to have, given that bank statements are the reason calendar periods exist.

Most of the rest are quarterly-only products anyway. Eighteen of the 21 are graded at zero of the 16 tax-return items on the same 5 August 2026 scrape, so for those, the calendar election is unlikely to be the deciding factor in your choice.

Where TapTax sits

TapTax supports both standard and calendar update periods, and the calendar path has been verified against HMRC's sandbox. If you want month-end periods, the option is there on the free tier as well as the paid ones.

To be precise about status, because it should affect your decision: TapTax is MTD-compatible and going through HMRC's recognition process, and it does not appear on the find-software directory as of the 5 August 2026 scrape. Every product named on this page is listed today. If a published HMRC listing before you commit is essential to you, choose from the 101 listed products that support calendar periods.

You can filter the whole dataset yourself on the MTD software directory, and our analysis of all 122 tools puts this feature in the context of the rest of the market.

The short answer

Choose calendar quarters if your books already close at month end, and especially if you are a landlord collecting rent on fixed dates. Stay on standard quarters if your software cannot offer the choice, if you have already filed this year's first update, or if you genuinely do not mind either way.

Whichever you pick, make the decision before your first update of the tax year, check the setting for each business separately, and remember that it changes nothing about when you file or what you pay. For the full timetable, our guide to the MTD deadlines for 2026, 2027 and 2028 sets out every date, and the quarterly submissions guide walks through what each update contains.