Income Protection Insurance Calculator — The Honest 2026 Numbers

Income protection insurance pays a regular, tax-free monthly income if you're unable to work due to illness or injury, continuing until you return to work, the benefit period ends, or you reach retirement, depending on the policy you choose. Unlike critical illness cover, which pays a one-off lump sum for specific serious diagnoses, income protection replaces ongoing income for genuinely any illness or injury that stops you working, however common or however serious.

Running your own numbers through a proper income protection insurance calculator matters because the two big cost levers — deferred period and occupation class — interact in ways that aren't obvious from a single headline premium quote. Two people earning identical salaries can face genuinely different costs purely from their job title and how long they could realistically wait before needing the money, which is exactly what this tool is designed to make visible before you speak to an insurer.

It's also worth understanding what income protection doesn't cover. It won't pay out for voluntary redundancy or simply choosing to reduce your hours, and most policies exclude pre-existing conditions disclosed at the point of application, at least for a defined period. It is specifically designed around the scenario of a genuine, unplanned inability to work due to health.

Employees at least have Statutory Sick Pay as a legal minimum, however inadequate, plus whatever additional sick pay their specific employer offers on top. Self-employed people have none of this — no SSP, no employer scheme, no guaranteed continuation of income during illness. For a freelancer or contractor, not working genuinely means not earning, full stop, from day one of an illness or injury.

This is exactly why an income protection insurance calculator is worth running early for anyone self-employed, rather than treating it as an optional extra to consider once the business is more established. Many self-employed people intuitively want a very short deferred period, sometimes even "day one" cover, precisely because they have no fallback income at all — but this comes at a genuinely significant premium cost, and building even a modest emergency fund alongside a moderate deferred period is often the more balanced approach financially, rather than paying a premium for the shortest possible wait.

Statutory Sick Pay (SSP) is roughly £116.75 a week for 2025/26, paid for a maximum of 28 weeks. For a household accustomed to earning £2,500 a month, dropping to around £500 a month on SSP alone is a genuinely severe income shock — exactly the gap income protection insurance is designed to fill. Employer sick pay schemes often extend this somewhat, but rarely indefinitely, and self-employed people have no employer scheme at all to fall back on.

It's worth checking your specific employer's sick pay policy in detail rather than assuming it matches the statutory minimum or some generic industry standard. Contractual sick pay varies enormously between employers — some offer full salary for 6 months or more, others offer little beyond the SSP floor. Knowing this figure precisely, in weeks, is the direct input that determines the most cost-effective deferred period for an income protection policy, since there's genuinely little value paying extra for a shorter deferred period than your existing sick pay already covers.

The deferred period is the waiting time after you stop working before payments begin. Matching this to your actual financial resilience — employer sick pay, emergency savings — is the single most effective way to reduce your premium without genuinely sacrificing meaningful cover. If your employer provides 6 months of full sick pay, a 26-week deferred period is a straightforward, cost-effective match.

Working out your own ideal deferred period starts with an honest inventory of what you already have. Add up your employer's sick pay entitlement in weeks, plus how many weeks of essential expenses your emergency savings would genuinely cover, and that combined figure is a sensible starting point for your deferred period. Setting the deferred period shorter than this means you're effectively paying extra premium for a gap in cover you'd never actually need to claim against, since your existing sick pay or savings would already be carrying you through that window.

For most employed people with reasonable job security, a deferred period of 13 to 26 weeks tends to strike a sensible balance — long enough to keep premiums genuinely reasonable, short enough that a serious illness or injury doesn't leave a meaningful income gap before payments start.

Insurers grade jobs by risk into occupation classes. A Class 1 office-based accountant might pay £30 a month for cover that would cost a Class 3 or 4 construction worker £80 a month or more for equivalent protection. Smokers typically pay 50% to 100% more than non-smokers — and most insurers count any nicotine use, including vaping, within the last 12 months.

It's genuinely important to describe your occupation accurately on any application. Understating the physical demands of your job to secure a cheaper premium can give an insurer grounds to refuse a claim entirely, precisely when the cover is needed most. That said, some roles can legitimately be reclassified into a more favourable occupation class by a broker who understands how different insurers categorise specific jobs — a genuinely worthwhile conversation to have if your role sits near a boundary between classes, since this is entirely legitimate and can meaningfully reduce cost without misrepresenting anything.

The premium gap between the two definitions is genuinely significant, but for anyone with specialised skills, physically demanding work, or a role where an alternative desk-based job would represent a serious drop in income and identity, own occupation cover is generally worth the extra cost. Any occupation cover can leave a genuine gap in protection precisely for the people who need it most: a skilled tradesperson who could theoretically manage a call-centre job, on paper, but whose actual career and earning potential would be devastated by the switch.

Short-term policies cap payments at a fixed period per claim, typically 1 to 2 years — genuinely cheaper, often 30% to 50% less than equivalent long-term cover, but payments stop even if you're still unable to work once that period ends. Full-term (or long-term) cover continues paying until you recover or reach retirement age, offering considerably stronger protection at a proportionally higher cost.

For budget-constrained buyers, a short-term policy is genuinely far better than no cover at all, and can always be upgraded to full-term protection later as circumstances allow. The real risk with short-term cover is a genuinely long-term condition — a serious illness with a slow, uncertain recovery could see payments stop at the 1 or 2-year mark, precisely when ongoing income replacement matters most. If budget allows, full-term cover to retirement age removes this specific risk entirely, and is generally the stronger choice for anyone with a mortgage or dependants relying on their income continuing indefinitely.

It's also worth understanding premium type before comparing quotes between insurers. A guaranteed premium stays fixed for the life of the policy, offering certainty but usually starting slightly higher. A reviewable premium can be adjusted by the insurer over time based on claims experience across their wider customer base, often starting lower but carrying genuine uncertainty about future cost. An age-rated premium increases predictably each year as you get older, reflecting rising risk, and is usually the cheapest option at outset but the most expensive over a long policy term. None of these is universally "better" — the right choice depends on how much budget certainty you value against the lowest possible starting cost.

Here's how the numbers work through a real income protection insurance calculator scenario. You're 35, earning £40,000 a year, an office-based (Class 1) non-smoker, wanting to protect 60% of your income. That's a monthly benefit of £2,000, tax-free. At a 13-week deferred period, the estimated premium is roughly £54 a month. Choosing a 4-week deferred period instead, the estimated premium rises to roughly £86 a month — a genuine difference of £384 a year for otherwise identical cover, simply from matching the waiting period to a realistic level of personal financial resilience.

Official sources & further reading: read general protection insurance guidance at MoneyHelper, compare policies at Which?, and verify any broker on the FCA register. Compare against our critical illness cover calculator, or browse every tool on the mortgage calculators homepage.