Almost everything you can claim when you are ill has a window, most of the windows are short, and nobody tells you they are open while you are still absorbing the diagnosis.

Which window is closing first

Mark your situation and roughly how long this has been going on. The tool sorts the kinds of window by how soon each one closes, shows which have already gone, and names the single thing to do today. It cannot know what the schemes are called where you live — that part you confirm locally — but the shape and the order are the same almost everywhere. Nothing is saved and nothing leaves the page.

The kinds of window, and roughly how long they stay open

Names and lengths differ by country and by employer. The shapes do not. These are the ones worth knowing exist, in the order they usually close.

• A refusal letter: days to a few weeks. The shortest window on this page and the most often missed. A decision you disagree with almost always has a formal reconsideration or appeal period counted from the date on the letter, and a large share of challenged decisions are changed at that first stage. Diary the date the moment the letter arrives.
• Telling the employer, and the certificate: the first days. Most sick pay depends on the absence being reported the way the contract says and covered by a certificate from the start. Retrospective certificates are possible but awkward, and a gap in the middle is what stops payment months later.
• An insurance or scheme notification: weeks. Income protection, mortgage or loan payment protection, credit card cover, union or professional-body benefits, employer group schemes. Nearly all require notification within a set period, and nearly nobody remembers they have one. Check the mortgage paperwork, the bank account benefits and the union.
• Telling a lender or landlord: before the arrears, not after. There is almost always a hardship or forbearance route, and it is far wider before a payment is missed than after two are. The conversation is administrative, not moral.
• Sick pay and short-term benefit: the first weeks. Whatever the local version is called, it usually starts from a claim rather than automatically, and backdating is limited to a fixed period.
• Reclaiming costs: usually a few months per receipt. Hospital travel and parking, prescription charges, dental and eye costs, equipment. These are reimbursement schemes with per-claim time limits, which is why the receipts matter more than the totals.
• Local tax, utility and social tariffs: months, with limited backdating. Reductions on local taxes, water and energy social tariffs, and hardship funds all exist and all go unclaimed. They are usually backdated only to the date you asked.
• The longer-term claim: opens later, and takes months. The disability or long-term incapacity route usually cannot start until it is clear the illness is not short, and the assessment itself takes months — so it is started while the short-term money is still running, not after it stops.
• The employer's duty to adjust: no deadline, but it decays. Adjusted duties, phased return and reasonable adjustments are an ongoing obligation, but the conversation is easiest early and hardest after a long silence.
• Ill-health pension access: months, and rarely urgent. Early access on health grounds exists in many schemes and is worth asking about at the point the illness looks permanent — not before, and not from a position of panic.

If a window has already closed

• Late is not the same as never. Most systems have a route for a late claim where there is a good reason, and being in hospital, being too unwell to deal with post, or not having been told are all reasons that are routinely accepted. The route is usually called something like “good cause” or “special circumstances”.
• Ask in writing, and date it. A dated written request — even an email — is what makes a backdate arguable, because it establishes when you asked. Verbal requests vanish.
• Say plainly why it is late. “I was an inpatient from the 3rd to the 24th and I was not told this existed” is a complete explanation and it is the kind of sentence these rules exist for. Nobody needs to be impressed.
• A refusal at the first attempt is not the end. Reconsideration and appeal succeed often enough that giving up at the first no is the expensive choice, and a large share of overturned decisions turn on a document that was never sent rather than on a change of mind.
• Some of it genuinely is gone, and knowing which is worth more than hope. If a window is closed and there is no late route, stop spending the afternoon on it and spend it on the next one that is open — the tool above puts them in order for exactly this reason.
• Get help doing it rather than doing it alone. Free advice services, hospital social workers, patient organisations and union representatives do this every day and know the local names for everything. One appointment with one of them is worth more than a week of forms.

The employer conversation

• Report it the way the contract says, on the first day. Not by text to a colleague. Whatever the policy names — a phone call to a named person, a portal, a form — do that, and keep a note of when you did.
• Get the certificate to cover the whole absence with no gaps. A gap of a few days between certificates is one of the commonest reasons pay stops, and it is fixed far more easily at the time than six weeks later.
• Ask what the occupational sick pay actually is, in writing. Many employers pay more than the statutory minimum for a defined period, and many people never find out until it stops.
• Adjusted duties are a conversation to have early, while you are still in contact and before a long silence has made everything harder. Reduced hours, different tasks, a phased return and working from home are all ordinary adjustments, and asking for them is not an admission of anything.
• Occupational health is usually on your side, and is not your employer's doctor in the sense people fear. A report that recommends adjustments is a useful document to have. You can normally see it before it goes to the employer, and you can ask for corrections.
• Do not sign a settlement or resign while you are unwell. Anything that ends the employment usually ends the sick pay, the insurance cover and the adjustment duty with it. Get advice first, and take the time to get it — a deadline on an offer is not the same as a deadline in law.

If you work for yourself

• There is no employer sick pay, so the windows are different, not absent. The short-term state benefit, if there is one, usually depends on contributions already paid, and the claim still has to be made rather than arriving.
• Check for insurance you already hold. Income protection, critical illness cover, accident cover attached to a bank account or a trade body, and business loan protection are all common and all have notification windows.
• Tax and contribution deferral exists nearly everywhere and is asked for rather than offered. Asking early is a payment arrangement; asking after a missed deadline is a penalty conversation.
• Tell the people you owe money to before the first missed payment. Suppliers, landlords and lenders have far more room while an account is current.
• Do not keep working badly instead of claiming. Trading through a serious illness at a quarter of your capacity is how a business and a recovery are lost at the same time, and in many systems doing a little work is allowed while claiming — that is worth checking rather than assuming.
• Keep the records as you go. Dates you stopped, what you could and could not do, what the illness cost. Reconstructing that a year later, for an assessment, is the part everybody underestimates.

The money leaking that nobody claims

The decision letter

• Find the date and the deadline before you read the reasons. The clock starts from the date on the letter, not from when you opened it, and it is often the shortest window in this whole subject.
• Ask for the reasons in full if they are not clear. A decision you cannot understand is one you cannot challenge, and asking usually pauses nothing — so lodge the challenge and ask at the same time.
• Challenge on the facts and the evidence, not on how unfair it feels. The overturns come from a missing letter, a report nobody read, a description of a bad day when the form asked about a typical one — not from indignation.
• Describe the worst realistic day, and the cost of doing things. Assessments routinely miss the difference between doing something once and doing it repeatedly, safely, and without paying for it for two days afterwards. Say that explicitly.
• Get the medical evidence sent, and check it arrived. A supporting letter from the treating clinician is the single most useful document, and the commonest reason a challenge fails is that it was never received.
• Use a free advice service for this specifically. Success rates with representation are markedly better, it costs nothing, and they know which sentence in the local rules is the one that matters.

The other person in the house

• A carer often has their own entitlement, claimed separately. An allowance, a paid or unpaid leave right, a reduction, an assessment of their own needs. It is claimed by them, not by the person who is ill, and it is missed constantly.
• Carer's leave and emergency leave are usually short but real, and asking for them early is easier than explaining a pattern of unexplained absences later.
• A carer's assessment is a separate thing from the patient's assessment, and it is the route to respite, equipment and practical help.
• Two incomes falling is one household problem. The partner who cuts their hours to drive to appointments is part of the loss, and their employer has adjustment duties too.
• Put one person in charge of the paperwork, and not the patient if it can be avoided. A person mid-treatment is the worst possible administrator, and most systems will let somebody act on their behalf with written permission — which is worth arranging early, once, in writing.

What people believe, and what is so

The drill: 16 decisions

Sixteen ordinary weeks — the letter left unopened, the policy nobody remembered, the certificate with a four-day gap, the refusal accepted at the first no. Most have an instinctive answer that feels dignified and costs real money. Pick your move; every answer explains why.

The card

Print it, fill in the dates, and put it with the envelope of receipts.

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