Right to Buy Discount & Break-Even Calculator (UK, 2026)

Calculate your Right to Buy discount (35–70% for houses / 50–70% for flats, capped £102,400 non-London / £136,400 London), monthly ownership cost (mortgage + maintenance + insurance + service charge), cumulative break-even against social rent rising 3.5%/year, 10-year equity projection (discount + appreciation + capital repaid), and 5-year clawback liability if you sell early.

⏱️ 5-8 minutes • 💪 Standard

Updated April 2026

How This Tool Works

📋 Purpose

Right to Buy in England lets council and most housing-association tenants with 3+ years of qualifying tenancy buy their home at a discount of up to 70% (capped at £102,400 non-London or £136,400 London). But the headline discount is only half the picture: mortgage interest, service charge on flats, insurance, maintenance and a 5-year clawback window combine to make or break the decision. This tool computes your specific discount, monthly ownership cost, break-even point vs your current social rent rising at 3.5%/yr, 10-year equity projection, and clawback liability in a single view.

⚙️ How It Works

  1. 1
    Step 1: Select property type, region, years tenancy and market value.
  2. 2
    Step 2: Set deposit %, interest rate and mortgage term.
  3. 3
    Step 3: Set planned holding, current weekly rent and service charge.
  4. 4
    We apply the discount taper (house or flat) to your tenancy years.
  5. 5
    We cap the discount by region (London £136,400 / else £102,400).
  6. 6
    We compute mortgage payment on discounted price.
  7. 7
    We add maintenance, insurance and service charge.
  8. 8
    We compare cumulative ownership vs cumulative social rent over your holding.
  9. 9
    We project equity (discount + HPI + capital repaid) and flag clawback.

Right to Buy — Break-Even Calculator 2026

Is Right to Buy worth it? Break-even vs rising social rent over your holding period.

Right to Buy gives council and housing-association tenants a discount of up to 70% on their home (capped £102,400 non-London / £136,400 London). This tool compares your monthly ownership cost against rising social rent and shows when the accumulated mortgage payments pay back relative to staying a tenant — factoring the 5-year clawback window.

1Tenancy & property

2Mortgage

3Plans & current rent

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Right to Buy — The Honest Maths

How the discount, clawback and ongoing costs interact — and whether buying your council home actually beats staying.

📅 Last updated: April 2026

Quick Tips

Jump-start your understanding with these essential tips

Clawback is front-loaded. Selling in year 1 = 100% discount repaid. Year 5 = 20%. After year 5: none.

Flats can carry £1,500–£4,000/yr service charge plus lumpy major-works bills. Houses have maintenance you control.

London cap (£136,400) is 33% higher than non-London (£102,400) but London properties are often 2-3x more expensive.

The council appoints a valuer who sets the "market value" before discount. You have 12 weeks to appeal via independent RICS valuation.

Halifax, Nationwide, Nottingham BS offer dedicated RTB products that accept 100% LTV of discounted price. Rates 0.3–0.6% higher than standard but no cash deposit needed.

Step-by-Step Guide

Follow these steps to get the most from this tool

Select house or flat (different discount tapers), region (London / non-London cap), years of qualifying tenancy, and current market value (council will send you a valuation letter).

Your deposit %, expected interest rate, and term. Discounted purchase price + deposit + mortgage drives the monthly cost.

How long you plan to hold, your current weekly social rent (crucial — drives break-even vs stay-tenant), and service charge if it's a flat.

Raw % (taper), raw £ (% x market value), and applied discount after regional cap.

Mortgage + maintenance + insurance + service charge. Compare to current rent.

Red line: cumulative social rent if you stay tenant (rises 3.5%/yr). Green: cumulative ownership cost. Cross-over = break-even month.

Total equity = discount + appreciation + capital repaid. Clawback warning if holding < 5 years.

Advanced Topics

Deep dives for advanced users

After you submit RTB1 form, the council sends a Section 125 notice with their market value (the base for your discount). You have 12 weeks to appeal if you disagree, paying for an independent RICS red-book valuation. A £10,000 valuation reduction is worth £3,500–£7,000 in discount. Common appeal wins: council has ignored damp, structural issues, or comp sales in downturn.

If your home transferred from a council to a housing association while you were a tenant (common during 1990s–2000s stock transfers), you may have Preserved Right to Buy. Same discount rules but applies through the housing association. Check your tenancy agreement for "Preserved Right to Buy" wording.

When the council is your freeholder and you're the leaseholder, major works (roof, lift, brick repointing) are billed to leaseholders under Section 20 consultation rules. Some leaseholders receive £30,000+ bills with no warning because they didn't engage with the council's Section 20 process. Before RTB on a flat, request (1) last 3 years of service charge accounts, (2) the council's 5-year capital works plan, (3) any outstanding major works proposals.

Right to Buy is not taxed (the discount isn't income). But: SDLT applies on the discounted purchase price (first-time buyer relief available if you qualify, though most RTB purchasers aren't FTBs). Capital gains on eventual sale is exempt if it remained your main residence. Selling a flat within 5 years triggers clawback — see home buying affordability to model the onward purchase.

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