Paying a January Tax Bill in Instalments
A January tax bill that is bigger than the cash in your account is a horrible feeling, but it is also a very common one for freelancers and small business owners. The key is to act before the due date, not after. Both HMRC and the IRS have ways to spread a tax bill over time, and a calm plan now can keep penalties down and your business running.
Key takeaways
- Check the bill first: make sure the figures are right and that you understand which payments it includes.
- In the UK, HMRC Time to Pay arrangements let people spread a tax bill in instalments. Check eligibility on GOV.UK.
- In the US, the IRS offers short-term and long-term payment plans for tax balances, but penalties and interest still apply.
- Pay what you can by the deadline, set up the plan early, and budget each instalment alongside your current tax so you do not fall behind again.
January is tax month for a lot of small businesses. In the UK, Self Assessment online returns and balancing payments are due on 31 January, and many people also owe their first payment on account for the current year on the same day. In the US, the Q4 estimated tax payment for 2027 is due on 18 January 2028, just a few weeks after the most expensive month of the year.
If you already know you cannot pay the full amount, you are in a better position than you might think, because you still have time to choose how to handle it. This guide is general information, not tax advice. Rules and eligibility change, so check the official HMRC or IRS guidance and talk to an accountant or tax adviser about your own situation.
Why January tax bills feel so large
Understanding what makes up the bill helps you plan, and sometimes shows the bill is smaller than it first looks.
UK: balancing payment plus payment on account
Self Assessment taxpayers usually pay two payments on account, on 31 January and 31 July, when their last bill was over £1,000, unless most of their tax was collected at source. So the January bill can combine two things: the balancing payment for last tax year, and the first advance payment toward this one. In a year when profits jumped, that combination can be a shock.
US: Q4 estimate on top of everything else
Self-employed people and many small business owners pay estimated tax during the year. The January payment covers the last part of the year, and it often lands when cash is low after the holidays. If earlier estimates were too small, you may also be heading toward a balance due when you file in the spring.
Pro tip
Write the bill out as separate lines: last year's balance, any advance payment, and any penalties or interest. Different parts can sometimes be handled differently, and seeing them apart makes the conversation with an adviser much quicker.
Check the bill before you plan to pay it
Before setting up any plan, make sure you are paying the right amount.
- Review the return or estimate. Check income, expenses and allowances. A missed expense or a typo in your figures can change the total.
- Look at advance payments. In the UK, if you expect lower profits this year, you may be able to ask to reduce your payments on account. Check the rules on GOV.UK and get advice, because reducing them too far can lead to interest later.
- Confirm what you have already paid. Check your online tax account for payments already credited, so you do not double count.
- Note the exact deadline. Write it down with the amount. Missing it is what triggers most penalties.
Common mistake
Ignoring the bill until after the deadline because the full amount feels impossible. Paying nothing and saying nothing is usually the most expensive choice. Paying part of the bill on time and asking for a plan for the rest keeps more options open.
Option 1: HMRC Time to Pay (UK)
HMRC Time to Pay arrangements let people spread a tax bill in instalments. For Self Assessment, smaller debts can often be set up online without speaking to anyone, while larger or more complex cases may need a phone call. Eligibility rules apply, including being up to date with your returns, so check the current conditions on GOV.UK before you apply.
To prepare, have these ready:
- Your Unique Taxpayer Reference and the bill amount.
- Your bank details for a Direct Debit.
- A realistic monthly figure you can pay after essential personal and business costs.
- A short note on why you cannot pay in full, such as a slow season or a late-paying client.
- A simple view of your income and spending, in case you are asked about it.
Interest is normally still charged on tax paid late, even under an arrangement, so a shorter plan usually costs less. Pick a monthly amount you can keep up through quiet months too; missing instalments can cause the arrangement to be cancelled.
Option 2: IRS payment plans (US)
The IRS offers short-term and long-term payment plans for tax balances. A short-term plan gives you extra time to pay in full; a long-term plan, often called an installment agreement, spreads the balance into monthly payments. Many people can apply online once a return has been filed and the balance is known. Penalties and interest still apply while you pay, and setup fees can vary by plan type and payment method, so check the current details on IRS.gov.
Because estimated tax payments are not usually bills in the same way, the practical approach for a missed or short Q4 estimate is often to pay as much as you can now, then deal with any remaining balance and plan when you file. An enrolled agent or CPA can help you work out what makes sense.
How to set up an instalment plan step by step
Whichever country you are in, the process follows the same shape.
- Confirm the total. Use your filed return or tax account, not a guess.
- Work out what you can pay now. Look at your cash for the next six weeks and keep enough for payroll, rent and essential suppliers.
- Pay that amount by the deadline. A part payment reduces the balance that interest is charged on.
- Choose a monthly instalment. Base it on your quietest months, not your best ones.
- Apply for the plan. Use the online service where you can, and keep the confirmation.
- Automate the payments. A Direct Debit or scheduled payment protects you from simply forgetting.
- Keep current tax up to date. Set aside money for this year's tax as well, so the plan does not snowball.
Budget each instalment alongside current tax
The biggest risk with an instalment plan is paying off last year's bill while quietly building up next year's. Plan both at once. The template below shows a simple way to do it. All amounts are made-up examples.
| Month | Old bill instalment (example) | Set aside for this year's tax (example) | Total tax cash needed | Paid on time? |
|---|---|---|---|---|
| February | £400 | £300 | £700 | Yes |
| March | £400 | £300 | £700 | Yes |
| April | £400 | £350 | £750 | Pending |
If the total in the fourth column is more than you can manage, revisit your monthly instalment before you apply, not after you miss a payment.
Example
Imagine Aisha, a UK web designer. Her January bill is £5,200: a £3,000 balancing payment and a £2,200 first payment on account. She has £2,000 she can safely pay by 31 January. She pays that, applies online for a Time to Pay arrangement for the remaining £3,200 over eight months, and sets up a Direct Debit. She also moves a fixed share of every client payment into a separate tax account for July. (All figures are made up for illustration.)
What to avoid when a tax bill is due
When the deadline is close, some quick fixes look tempting. A few can make things worse.
- Expensive short-term funding. A merchant cash advance is repaid from a share of future card sales, and its cost, often expressed as a factor rate, can be very expensive compared with loans. That is rarely a good way to pay a tax bill that could be spread at lower cost.
- New personal guarantees in a rush. A personal guarantee makes you personally liable if the business cannot repay. Do not sign one under deadline pressure.
- Skipping payroll taxes or VAT to pay income tax. Moving the problem from one tax to another usually adds penalties.
- Unregulated "tax debt" services. Be wary of anyone promising to make a tax debt disappear for a fee. Go to the official HMRC or IRS service, or a qualified adviser.
Common mistake
Agreeing to a monthly instalment that only works in your best month. If sales dip in February or March, a plan that was tight from day one breaks quickly. Pick an amount that still works in a slow month.
Stop next January's bill being a surprise
Once the plan is running, set up a habit that keeps it from happening again. A separate tax savings account, topped up with a fixed share of every payment you receive, is the simplest version. Review the balance each quarter against what you expect to owe, and talk to your accountant mid-year if profits are rising fast. A smaller adjustment in summer is far easier than a big gap in January.
Pro tip
Put every tax date for the year into your calendar now, with a reminder two weeks before each one. In the UK, that includes the 31 July payment on account; in the US, each quarterly estimate.
Your January tax bill action plan
- Break the bill into its parts and check the figures
- Confirm payments already credited in your online tax account
- Work out what you can safely pay by the deadline
- Pay that amount on time
- Check eligibility for HMRC Time to Pay or an IRS payment plan
- Choose an instalment that works in a slow month and apply
- Automate the instalments and save the confirmation
- Start setting aside money for this year's tax at the same time
Frequently asked questions
Will a payment plan stop penalties and interest?
Not entirely. In the US, penalties and interest still apply while you pay under a plan. In the UK, interest is normally charged on late tax, though arranging a plan in time may help you avoid some late payment penalties. Check the current rules on the official sites.
Can I set up a plan before the deadline?
Often yes, once the return has been filed and the amount is known. Acting early usually gives you more choice and shows good faith.
What if I miss an instalment?
Contact HMRC or the IRS as soon as you can. Missed payments can cause a plan to be cancelled, but explaining early may let you adjust it.
Should I use a credit card to pay my tax bill?
It is possible in some cases, but card interest and processing fees can make it costlier than an official plan. Compare the total cost of both before deciding.
The bottom line
A January tax bill you cannot pay in full is stressful, but it is manageable if you move early. Check the figures, pay what you safely can by the deadline, and use HMRC Time to Pay or an IRS payment plan for the rest, with an instalment that still works in a slow month.
Then protect next year by setting money aside from every payment. The aim is simple: one plan for last year's bill, one habit for this year's, and no more January surprises.
