Tax Finance Guide

Self Assessment Tax Bill

The 31 January self-assessment deadline covers both the actual tax for the prior year and the first payment on account for the current year. For many self-employed individuals, landlords, and directors, January creates an acute cash pressure.

5 min read

This guide covers every practical option - from HMRC Time to Pay to property-backed bridging - by taxpayer type.

SA Options by Taxpayer Type - August 2026

Taxpayer typeWhy January is difficultBest solution
Company director (salary + dividends)Large dividend SA tax bill. Company needs its own cash. POA on top.Personal property bridge - BTL or second home. Or HMRC TTP if approved.
Self-employed seasonal businessPeak revenue does not match January quiet period.Bridge on business premises or HMRC TTP with credible cashflow evidence.
BTL landlord - large portfolioAnnual SA on net rental income. Rental arrives monthly; SA falls annually.BTL property bridge - typically very low LTV, good rates achievable.
Freelancer - first year high income150% demand: actual tax + first POA at new higher income level.Personal property bridge. Or reduce POA if current year income lower.
Investor - capital gains in yearSA reconciles 60-day CGT payment. Additional tax may be due.Bridge on remaining portfolio. Or check whether 60-day CGT overpaid (refund due).

Indicative rates - August 2026. Rates change daily. Actual rate depends on LTV, security, credit profile, loan size, and exit strategy. Contact our team for a live rate comparison for your specific case. All rates sourced from lender product sheets and publicly available market data.

What determines your rate

The payment on account - why January bills are larger than expected: If SA tax exceeds £1,000, HMRC requires a first payment on account (50% of prior year's tax) alongside the main payment on 31 January. In a year where income jumps significantly, January can require payment of 150% of the prior year's January bill. This is the single most common source of SA surprise - model it in advance with your accountant.

Reducing payments on account: If current year income will be significantly lower than last year, apply to HMRC to reduce the POA before the deadline. Log into SA online and use "Reduce payments on account." If reduced below the actual liability, interest applies on the shortfall. Get accountant advice before reducing.

HMRC SA payment helpline: Call 0300 200 3822 before the deadline. HMRC can offer a short extension or TTP. The 5% surcharge (at 30 days, 2 March for January deadline) is avoided if TTP is agreed before the surcharge date. Always call before 2 March - not after.

January peak demand for bridging: DBF arranges more SA bridging in January than any other month. Contact us before 20 January for the best timeline. Emergency bridges for January deadlines are possible in the final week - but earlier is always better.

Worked cost example

  • Freelance architect - first year of high earnings.
  • 2024/25 SA: £28,400. First POA: £14,200. Total 31 January: £42,600.
  • Cash available: £18,000. Shortfall: £24,600.
  • Owns commercial office (£380,000 freehold, no mortgage).
  • Option A - HMRC TTP (call 20 January, propose 6-month plan):
  • If approved: interest ~£700. No fees. Total: £700. Risk: approval not certain.
  • Option B - Property bridge (£24,600 on office at 0.65%/month, 3 months):
  • Cost: £485 interest + £369 fee + £1,800 legal = £2,654. Certain. 10-14 days.
  • INTEREST BREAKDOWN - HMRC TTP: ~£700 interest for 6 months on £24,600. Zero fees.
  • INTEREST BREAKDOWN - Bridge: £485 interest + £369 fee + £1,800 legal = £2,654.
  • NET SAVING - TTP vs Bridge: TTP (£700) saves £1,954 vs bridge (£2,654) IF approved.
  • HMRC cost if paid 35 days late (no TTP): 5% surcharge £1,230 + interest £181 = £1,411.
  • NET SAVING - Bridge vs 35-day late: Bridge (£2,654) costs £1,243 more than 35-day late payment.
  • NET SAVING - Bridge vs 90-day late: HMRC (£2,461) vs Bridge (£2,654). Bridge saves £207 at 90 days.
  • BEST APPROACH on 20 January: Pursue TTP and bridge simultaneously. TTP if confirmed within 48hrs. Bridge as certain backup.

Rate context and outlook

HMRC SA payment helplines reach peak call volumes in the last two weeks of January - wait times exceed 45 minutes. Contacting DBF in December or early January (when the shortfall is already predictable) allows bridge to be arranged with time to spare. Proactive planning beats reactive scrambling every time.

Key takeaways

The things to remember

  • 31 January: SA deadline - main tax + first payment on account
  • 31 July: Second payment on account
  • 7.75% p.a.: HMRC interest on late SA from 1 February
  • 5% surcharge: At 30 days (2 March for January deadline)
FAQs

Frequently asked questions

What is the 5% SA surcharge and when does it apply?

A 5% surcharge on outstanding SA tax at 30 days after the deadline. For the 31 January deadline, this falls on 2 March. A further 5% applies at 6 months and 12 months. Agreeing HMRC TTP before 2 March prevents the surcharge during the TTP period. Interest at 7.75% p.a. accrues from 1 February regardless.

Do I still need to file if I cannot pay?

Yes - filing and payment are separate obligations. If you file late, a £100 penalty applies (rising to £300 and daily penalties for extended late filing). File by 31 January even if you cannot pay - avoid the late filing penalty on top of the late payment costs.

Can my accountant apply for TTP on my behalf?

Yes - where HMRC has an authority to act on file for your accountant, they can call and negotiate TTP on your behalf. Many accountants do this as part of their service. Ask them to also explore bridging as a concurrent backup - whichever resolves the problem first is the right answer.

What if I cannot afford the legal fees for a bridging loan?

Bridge costs (including arrangement fee and legal fees) can typically be rolled into the loan - minimising the upfront cash requirement. The net advance after fees is the cash available to pay HMRC. We model the net advance against your shortfall to confirm viability before proceeding.

Can a company director use company property to pay personal SA?

A company cannot directly secure a personal loan - this creates tax complications (director benefit-in-kind, financial assistance rules). The correct structure is the director using personally-owned property (home, BTL, commercial property held personally) as security. The company's property can only be used for the company's own tax obligations.

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