You live abroad, you have UK rental income, and you file a UK Self Assessment. Your long-standing accountant — the one who’s been handling your tax return for years — is retiring. They’ve been letting you use their office address as your UK address for HMRC correspondence. Now your new accountant says they’d rather you use your own overseas address. The retiring accountant suggests using your letting agent’s address instead.

Is this a problem? And what should you actually do?

This is a real scenario that surfaces regularly in accountant forums, and it reveals a common misunderstanding about how HMRC’s address system works. The short answer: your accountant’s address should never be your base address at HMRC — but you don’t need it to be. Here’s why, and what to do instead.

How HMRC’s Address System Actually Works

Most people think HMRC holds one address for you. In reality, the Self Assessment system holds four types of address, each with a different purpose:

  1. Base address — Your principal residential address. This is the one that determines your UK tax residency status. HMRC uses it to decide whether you’re a UK resident, a non-resident, a Scottish taxpayer, or a Welsh taxpayer. It must match where you actually live.

  2. Communication address — Where HMRC sends post, if it’s different from your base address. You only need to set this if you want post to go somewhere other than your base address.

  3. Capacity address — The address of a person or body acting in a capacity role — typically your accountant or tax agent. If a capacity address is present, all correspondence goes there automatically, overriding both the communication and base addresses. The system can hold up to five capacity addresses.

  4. Business address — The address of any trade or business on your SA record. If you have multiple businesses, there can be several.

The system uses these addresses in a strict priority order for sending correspondence:

  1. Capacity address (if an agent is authorised) → agent gets everything
  2. Communication address (if set and different from base)
  3. Base address
  4. Main source business address

This priority system is the key to understanding the whole issue. When you authorise an accountant as your agent, their address becomes the capacity address, and HMRC sends all correspondence there automatically. You don’t need to use their address as your base address — the agent authorisation handles the routing.

Why Using Your Accountant’s Address as Your Base Address Is Risky

The retiring accountant in this scenario has been allowing the client to use their address as the client’s address at HMRC. This almost certainly means the accountant’s address is recorded as the client’s base address — not just a communication address.

This creates a specific problem. According to HMRC’s Self Assessment Manual (SAM101270):

“The customer’s base address is used to determine their UK tax residency status: it is therefore essential that the base address matches the customer’s residency status.”

If your base address is a UK address but you actually live abroad, HMRC’s system may:

  • Classify you as UK resident when you’re not, potentially triggering the wrong tax treatment
  • Apply UK tax rates and bands instead of the non-resident rules that may apply to your situation
  • Trigger Scottish or Welsh taxpayer status if the accountant’s address happens to be in Scotland or Wales — this is exactly the problem we documented in our Scottish tax code wrong address guide, where a stale address caused someone to be wrongly classified as a Scottish taxpayer for years
  • Fail to set the “abroad signal” — HMRC’s system uses this signal to separate overseas mail from UK second-class post, so without it, your correspondence may be delayed further

The base address is not a cosmetic field. It drives residency determination, which in turn drives which tax rules apply to you. Getting it wrong can be expensive and take months to unravel.

The Right Approach: Your Overseas Address + Agent Authorisation

The correct setup for a non-resident landlord is straightforward:

  1. Your base address = your actual overseas address. This ensures HMRC correctly identifies you as non-resident and applies the right tax rules. HMRC’s system will set the “abroad signal” automatically, which flags your post for overseas delivery.

  2. Authorise your accountant as your agent (via online authorisation or form 64-8). Once authorised, their address becomes the capacity address, and HMRC sends all correspondence to them automatically. You don’t need their address on your record as your base or communication address — the capacity address overrides both.

  3. Your accountant receives all HMRC post — tax return notices, statements of account, penalty notices, coding notices — and forwards or scans anything you need to see. This is how the vast majority of agent-client relationships work for UK-resident and non-resident clients alike.

This setup gives you the best of both worlds: correct residency classification (because your base address is overseas) and reliable post delivery (because your accountant receives everything as your authorised agent).

The retiring accountant in the scenario said they “only ever receive the Tax Return notice from HMRC.” That’s because most HMRC correspondence is now digital — available through your Personal Tax Account or your agent’s online portal. The Notice to File a tax return (the paper reminder) is one of the few things that still goes by post, and with agent authorisation, it goes to the agent, not to you.

The Postal Delay Problem (and the 64-8 Workaround)

The new accountant in the scenario raised a legitimate concern: when you use an overseas address, HMRC post can take weeks to arrive, and time-sensitive documents may expire before they reach you.

The most common casualty is the agent authorisation code. When you authorise a new agent online, HMRC sends a two-part code: one part to the agent, one part to you at your registered address. If your address is overseas, the code can take 2–4 weeks to arrive — and it expires before it gets there. This is a well-known problem for non-resident taxpayers.

The workaround is form 64-8. Form 64-8 is a paper authorisation form that doesn’t require an online code. Here’s how it works:

  1. Your accountant completes the relevant sections with their agent code and your details
  2. You sign it (the form must be signed by you, the taxpayer)
  3. Your accountant sends it to HMRC
  4. HMRC processes the authorisation — typically within 5–10 working days

No code, no postal delay on your end, no expiry window. The 64-8 is the standard fallback for non-resident clients precisely because the online code system doesn’t work reliably for overseas addresses.

According to HMRC’s guidance on authorising an agent, once authorised, your agent can submit tax returns on your behalf, discuss your current and previous returns with HMRC, view and change your details, view calculations and amounts owed, and handle your Self Assessment end-to-end. The 64-8 also lets you specify whether your Statement of Account should go to you or your agent.

If you’re switching accountants (as in this scenario), the new accountant can also use the paper form route to set up their authorisation without waiting for a code to reach you abroad.

Can You Use Your Letting Agent’s Address Instead?

The retiring accountant suggested the letting agent’s address as an alternative. This is worth examining, because it sounds reasonable but has the same fundamental problem.

A letting agent manages your property — they collect rent, handle repairs, deal with tenants. They are not your tax agent. Using their address as your HMRC base address creates the same residency misclassification issue as using your accountant’s address: HMRC sees a UK address and may flag you as UK resident.

You could theoretically ask the letting agent if they’d accept HMRC post for you and forward it — but:

  • Most letting agents won’t offer this. It’s not a service they provide, and they have no obligation to handle your tax correspondence.
  • It’s unreliable. Letting agents have high staff turnover; the person who agrees today may not be there in six months.
  • It doesn’t solve the base address problem. Even if they forward post, the address is still wrong for residency purposes.
  • It adds a link in the chain. Post goes HMRC → letting agent → you, instead of HMRC → accountant → you. More links means more delay and more risk of things going missing.

If you want post to go somewhere in the UK rather than overseas, the correct mechanism is the capacity address — i.e., authorise your accountant as your agent. That’s what it’s designed for. A letting agent’s address is a workaround for a problem that agent authorisation already solves properly.

What About the NRL1 Form?

If you’re a non-resident landlord, you may also need to file form NRL1 to apply to receive your UK rental income without tax deducted at source (the Non-Resident Landlord Scheme). The NRL1 form also asks for your address — and the same principle applies.

HMRC’s NRL1 guidance says you should include your principal residential address on the form. If you can only provide a “care of” or PO Box address, HMRC will accept a correspondence address instead, but you must attach an explanation of why you haven’t given your principal residential address.

This means: on the NRL1 form, use your actual overseas address as your principal residential address. Don’t use your accountant’s address or your letting agent’s address as your principal residential address — it’s not where you live, and it creates the same residency confusion.

For the full rules on how the Non-Resident Landlord Scheme works — including when letting agents must deduct tax and how to register — see our property tax UK landlord hub.

How to Update Your Address with HMRC from Abroad

If your base address at HMRC is currently your old accountant’s address and you need to change it to your overseas address, you have several options:

Option 1: Online (fastest)

Use HMRC’s change of address service. You’ll need to sign in to your Personal Tax Account. If you don’t have one, you can create one when you sign in for the first time — you’ll need to prove your identity (usually with a passport or driving licence).

Once logged in, you can update your address across your tax records. According to HMRC’s Self Assessment Manual (SAM126090), individuals who have registered for the SA Online service can change their address (main, capacity, and communication) through a secure online channel — no phone call required.

Option 2: Through your agent

If your new accountant is already authorised (or you’re using the 64-8 route), they can update your address through their agent portal. This is often the fastest route if you’ve already got the agent relationship set up.

Option 3: By phone

You can call HMRC’s Self Assessment helpline. From outside the UK, the number is +44 161 931 9070. Have your UTR ready. This is the fallback if you can’t use the online service — for example, if you can’t verify your identity digitally from abroad.

Option 4: On your tax return

If you file a paper return, you can update your address on the return itself. HMRC will update your record when they process it. This is the slowest option but requires no separate action.

Does Your Address Affect Your Tax Residency Status?

Yes — and this is the core reason the accountant in the scenario was right to be reluctant.

Your base address on HMRC’s Self Assessment system is one of the signals HMRC uses to determine your UK tax residency status. It’s not the only factor — the statutory residence test looks at where you live, where you work, and how many days you spend in the UK — but a UK base address on your HMRC record creates a conflicting signal that can cause problems.

If HMRC’s system shows a UK base address for someone who is actually non-resident:

  • The system may not set the “abroad signal” on your record, which means post is sent at UK second-class rates rather than overseas rates — adding further delay
  • Your tax code may be calculated as if you’re UK resident, potentially applying the wrong rates or bands
  • If the UK address is in Scotland or Wales, you could be flagged as a Scottish or Welsh taxpayer — with different income tax rates and thresholds that may not apply to you
  • When HMRC cross-references your record with other data (DWP, electoral roll, employer submissions), the UK address can reinforce an incorrect residency classification

This is the same mechanism that caused the Scottish tax code problem we documented in our wrong address guide — a stale address on HMRC’s record triggered a wrong taxpayer status that took months to fix.

For the full rules on how UK tax residency works for non-residents with UK income, see HMRC’s guidance on tax if you live abroad.

What to Do If Your Accountant Refuses

If your new accountant won’t let you use their address — as the accountant in this scenario planned to do — that’s actually fine. Here’s the practical setup:

  1. Register your overseas address as your base address with HMRC. Use the online change of address service or ask your new accountant to do it through their portal.

  2. Authorise your new accountant as your agent using form 64-8 (not the online code system, which will expire before it reaches you abroad). Your accountant sends the completed form to HMRC, and the authorisation is processed without postal delays.

  3. Once authorised, HMRC sends all correspondence to your accountant — the capacity address overrides your overseas base address for post. Your accountant receives your Notice to File, statements of account, and any penalty notices, and forwards anything you need to action.

  4. Access your digital records directly through your Personal Tax Account. Most HMRC correspondence is now available online — you don’t need to wait for post to arrive abroad.

  5. If you need to receive something by post directly, ask HMRC to send it to your communication address (your overseas address) rather than your base address. But in practice, with an agent authorised, almost everything goes to the agent.

This setup means your accountant doesn’t need to let you “use their address” at all. The agent authorisation mechanism handles the routing automatically — and correctly, because your base address stays as your overseas address, preserving your non-resident status.

The Bottom Line

  1. Your base address at HMRC must be your actual overseas address. It determines your UK tax residency status. Using a UK address (your accountant’s, your letting agent’s, or anyone else’s) as your base address can trigger incorrect residency classification, wrong tax codes, and Scottish/Welsh taxpayer status issues.

  2. You don’t need to use your accountant’s address. When you authorise an accountant as your agent, their address becomes the capacity address, and HMRC sends all correspondence there automatically. This is the designed mechanism for agent-handled post — not borrowing their address for your base record.

  3. Use form 64-8 for agent authorisation if you live abroad. The online code system sends a code to your address that can expire before it arrives overseas. The 64-8 is a paper form that bypasses the code entirely.

  4. Don’t use your letting agent’s address. They’re not your tax agent, they’re unlikely to offer this as a service, and using their address as your base address creates the same residency misclassification problem.

  5. On the NRL1 form, use your actual overseas address as your principal residential address. HMRC will accept a correspondence address if you can only provide a “care of” or PO Box address, but your principal residential address should be where you actually live.

  6. Most HMRC correspondence is now digital. Your Personal Tax Account and your agent’s online portal give you access to the same information that used to arrive by post. The Notice to File is one of the few things that still goes by post — and with agent authorisation, it goes to your accountant, not to you abroad.

For the complete guide to how UK property tax works for non-resident landlords — the Non-Resident Landlord Scheme, Section 24, allowable expenses, and capital gains — see our property tax UK landlord hub. For how Making Tax Digital applies to landlords and non-residents, see our MTD for landlords and non-residents guide. For the address problem that can trigger wrong Scottish taxpayer status, see our Scottish tax code wrong address guide.

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