Yes, you can hold a buy-to-let mortgage while you are serving, and plenty of forces personnel across Lincolnshire already do. The tricky part is rarely the property. It is finding a lender whose criteria fit military pay, postings and service accommodation, then getting the order of events right so a posting does not force a rushed sale or a worse rate. This guide walks through what actually works for people based at RAF Cranwell, Waddington, Coningsby, Digby and Barkston Heath, with real Lincolnshire numbers and the rules verified against current sources.
Can you get a buy-to-let mortgage while serving in the Armed Forces?
Yes. Service personnel take out buy-to-let (BTL) mortgages regularly. Some mainstream BTL lenders decline forces applicants, but that is usually a criteria mismatch (how they handle allowances or service accommodation) rather than anything wrong with you or the property. The core requirements are consistent across the market:
- A deposit of at least 20 to 25% of the purchase price, sometimes more for specialist cases.
- A property the lender is comfortable lending against.
- Rental income that passes the lender’s stress test (more on that below).
- A clean, well presented application that fits that particular lender’s criteria.
Because forces circumstances vary so much, the smart move is applying to a lender who already understands them, not simply the one with the lowest headline rate. Our buy-to-let mortgage advice page explains how we match cases to the right lender.
Can you use Forces Help to Buy for a buy-to-let? Clearing up the £25,000 confusion
No, not directly. Forces Help to Buy (FHTB) cannot be used to purchase a buy-to-let. The scheme rules are explicit that the property must be one you intend to live in. That catches a lot of people out, so it is worth being clear.
There is, though, a route that reaches the same destination. You use FHTB to buy a residential home you live in, and later let that home out, either by getting consent to let from your lender or by remortgaging onto a let-to-buy product. The path is residential first, buy-to-let later. The end result is still a property earning rent, but you have followed the rules and kept the scheme benefit intact.
How does Forces Help to Buy actually work?
FHTB is an interest-free advance of salary for Regular service personnel. The verified July 2026 rules are:
- You can borrow up to 50% of your annual salary, capped at £25,000.
- The advance is interest-free and normally recovered from your pay over up to 10 years.
- It can go towards your deposit and other costs, such as solicitor and estate agent fees.
- The scheme became an enduring (permanent) policy from 1 January 2023.
- If the loan exceeds £10,000 at any point in the year, HMRC treats the benefit as a taxable benefit in kind, so a small tax charge can apply.
- If you leave the Services before repaying, the outstanding balance is recovered from your terminal benefits.
If you are buying a home to live in first, our Armed Forces Help to Buy mortgage advice and the Forces Help to Buy calculator are the right starting points.
How much deposit and stamp duty will a buy-to-let cost?
Two upfront costs matter most. First, the deposit: budget for 25% of the purchase price for the widest lender choice, though some products accept 20%. Second, stamp duty. Since 31 October 2024, an additional property (which a buy-to-let is) carries a 5% surcharge on top of every standard Stamp Duty Land Tax band in England, where the price is £40,000 or more. That makes the effective bands 5%, 7%, 10%, 15% and 17%.
Here is what that means at prices typical of Sleaford, Lincoln and Grantham (illustrative, as of July 2026):
| Purchase price | 25% deposit | Stamp duty (additional property) |
|---|---|---|
| £150,000 | £37,500 | £8,000 |
| £180,000 | £45,000 | £10,100 |
| £220,000 | £55,000 | £12,900 |
You can check your own figure on the stamp duty calculator. Remember these are additional-property rates, which are higher than for a home you live in.
How do lenders treat military pay, postings and service accommodation?
A buy-to-let underwriter looks at three things beyond the property: how your income is built up, where you live now, and how stable your situation looks over time. Basic pay is straightforward. Complexity comes from allowances, X-Factor and specialist pay, which some lenders count in full and others discount or ignore. If you live in service accommodation and do not own a home elsewhere, some lenders hesitate, while others are perfectly comfortable once the case is presented properly. Your posting cycle forms part of the picture too. None of this stops you borrowing, but it does mean lender choice is everything.
What does the rent actually need to cover?
Every buy-to-let mortgage has to pass an Interest Coverage Ratio (ICR) stress test. The lender applies a stress rate (typically 5.5% on a five-year fix in 2026, or your product rate plus 2%, whichever is higher), works out the interest at that rate, and checks the rent covers it by at least 125% (basic-rate taxpayer or limited company) or 145% (higher-rate taxpayer holding the property in your own name).
A worked example with realistic Lincolnshire numbers. Take a £180,000 property with a £135,000 loan at 75% loan to value. Stressed at 5.5%, annual interest is £7,425, or £618.75 a month. The rent needed is:
| ICR band | Who it applies to | Monthly rent required |
|---|---|---|
| 125% | Basic-rate taxpayer or limited company | £773 |
| 145% | Higher-rate taxpayer in personal name | £897 |
So a £180,000 Sleaford terrace let at £900 a month clears the 125% test comfortably but is borderline at 145%. The surveyor decides the acceptable rent, not the asking-price optimism, so always work from a realistic local figure. The buy-to-let calculator lets you test your own numbers.
Is let-to-buy a smarter route for service personnel?
Often, yes. A common pattern looks like this: you use FHTB and a residential mortgage to buy near your posting, then you are assigned elsewhere a couple of years later and want to keep the home and let it out. That is let-to-buy, a remortgage of your existing home onto a buy-to-let basis so you can move on while it earns rent. It suits people with reliable posting cycles and a home that rents well locally. It suits you less if the numbers are tight or you may want to sell soon anyway. Either way, get advice well before the posting date, ideally six months out, because doing this in the wrong order can cause delays and a worse rate. If you are stepping into this for the first time, our first-time landlord mortgage advice covers the ground.
What tax points should a forces landlord know?
Three things are worth flagging, though none of this is tax advice and you should confirm your own position with an accountant. First, since 2020 landlords holding property personally can no longer deduct mortgage interest from rental income before tax, and instead receive a 20% tax credit, which is why higher-rate taxpayers face the stricter 145% ICR. Second, rental profit is taxable income and must be declared. Third, when you eventually sell a property that is not your main home, Capital Gains Tax may apply. These points shape whether personal or limited-company ownership suits you, and it is worth a conversation before you commit.
Common mistakes, and how to avoid them
- Applying to the wrong lender. A decline can stay on your credit file and make the next application harder.
- Confusing FHTB with a buy-to-let deposit. FHTB is for a home you live in, not a rental.
- Using optimistic rental figures. The surveyor sets the assessed rent, not the asking price.
- Applying without factoring in service accommodation, which some lenders weigh heavily.
- Leaving let-to-buy too late, which can force a rushed sale around a posting.
Common questions
Do I need to already own a home to get a buy-to-let mortgage?
Not always, but it helps. Many lenders prefer buy-to-let applicants who already own their own home, and fewer will lend to a first-time buyer whose first purchase is a rental. Living in service accommodation without owning elsewhere narrows the field further, though workable lenders do exist. This is exactly the kind of case where matching you to the right lender first time matters.
Can I let out a home I bought with Forces Help to Buy?
Yes, once it has been your home, usually by getting consent to let from your existing lender or by remortgaging onto a let-to-buy product. What you cannot do is use FHTB to buy a property purely as a rental from day one. The scheme is for a home you intend to live in.
How much deposit do I really need in Lincolnshire?
Plan for 25% for the widest choice of products, though some lenders accept 20%. On a £180,000 Sleaford or Grantham property that is £45,000 at 25%, plus stamp duty and legal costs. The larger the deposit, the easier the stress test tends to be and the better the rates available.
Where to go from here
If you are seriously weighing up a buy-to-let, whether a fresh purchase, a let-to-buy on your current home, or a plan around an upcoming posting, the sensible next step is a short conversation with someone who has done this before for service personnel. Spolton Mortgages is a family-run firm of former bank managers on Carre Street in Sleaford, working with applicants from Cranwell, Waddington, Coningsby and across Lincolnshire. Run your figures on the buy-to-let calculator, then talk to the team when you are ready.
Not all Buy to Let Mortgages are regulated by the Financial Conduct Authority.
Your home/property may be repossessed if you do not keep up repayments on your mortgage.
