The simple formula
Savings target = essential monthly spending × number of months until next reliable income. The two variables are knowable; the answer falls out.
The first variable comes from your bank statements. Add up the recurring monthly outgoings you can’t pause if income stops. Don’t guess; pull three to six months of statements and tally the lines that appear every month. For most UK households the figure sits between £1,200 and £2,500 per month.
The second variable comes from realistic job-search timelines for your sector and seniority:
- Mid-level office role, healthy sector: 1-3 months from focused search start to offer, then 1-3 months notice at the new role. Total income gap: 2-6 months.
- Senior or specialist role: 3-6 months search, 1-3 months notice. Total gap: 4-9 months.
- Sector switch (same level, different field): 6-12 months search because you’re competing with directly-experienced candidates. Total gap: 7-15 months.
- Going freelance: 1-3 months setup, 1-3 months to first contract, 1-2 months to first payment received. Total gap: 3-8 months of zero freelance income.
- Retraining: Course length plus job search. 6-24 months depending on the course.
Add a buffer
Realistic timelines are still uncertain. The 1-3 month office-role search assumes nothing goes wrong; the buffer assumes something will. A reasonable buffer is 20-30% on top of the expected timeline. So if the expected gap is 4 months, save for 5. If the expected gap is 8 months, save for 10.
The buffer pays for: a longer-than-expected search; an offer falling through at offer stage; a sudden need (boiler break, car repair, family emergency) that can’t wait for income to return; the lifestyle bills you forgot when tallying essentials (annual insurance renewals, occasional dental, MOT and service costs).
Worked example
Sarah is a mid-level marketing manager, has £1,800/month essentials, and wants to leave her current role to find a better-fit one in the same sector. Expected gap: 3-month search + 2-month notice at new role = 5 months. With 25% buffer = 6 months. Target savings: £1,800 × 6 = £10,800. If she currently has £3,000 saved, she needs to build another £7,800. At 20% net-income saving over 12 months, that’s comfortably doable.
James is a senior software engineer who’s decided to retrain as a teacher. £2,400/month essentials. Expected gap: 12 months training + 3 months search = 15 months. Plus 25% buffer = 19 months. Target: £2,400 × 19 = £45,600. James has £8,000 saved. He needs to build £37,600, which at any reasonable saving rate is 2-3 years of preparation before quitting. Worth knowing now rather than committing in 6 months and running out at month 14.
The calculator that does this maths
The can I afford to quit calculator on this site runs the calculation interactively with your actual numbers, including notice pay, partner income, and any expected freelance income. The emergency fund calculator gives a separate target for the underlying emergency fund.
What if you can’t save enough?
Three sensible adjustments before delaying indefinitely:
Cut essential monthly spending. The figure is more flexible than it feels. Renegotiating mobile and broadband, switching energy tariffs, auditing insurance, cutting subscription bloat usually finds £150-£400 per month for most households. That reduces both the savings rate needed and the future runway burn rate. See cutting monthly costs after redundancy for the categories that yield most (the same logic applies before resigning).
Find the next role before resigning. The job search is easier from a position of employment (more negotiating power, lower money pressure, more time flexibility). If finances are tight, lining up the next role first turns a multi-month gap into a 2-4 week one.
Negotiate timing with your current employer. Sometimes a few months of unpaid sabbatical, reduced hours, or a planned end date can buy enough margin without requiring full resignation now. Worth asking; not every employer offers it, but more do than is widely realised.
Frequently asked questions
- How much should I save before quitting my job in the UK?
- A practical rule of thumb: 3 months of essential spending is the floor for a same-sector job search in a healthy market; 6 months gives breathing room; 9-12 months covers a sector switch or going freelance. Calculate from your essential monthly spending, not from your previous salary.
- What counts as 'essential' spending for this calculation?
- Rent or mortgage, council tax, utilities, food, transport, insurance, phone and internet, minimum debt repayments, childcare. Streaming services, eating out, holidays and gym memberships are discretionary and not in the figure. Most UK households' essential spending sits between £1,200 and £2,500 per month.
- What if I can't save enough before quitting?
- Three options. Delay resignation while saving (3-6 months of disciplined saving makes a real difference). Reduce essential monthly spend so the same savings cover more months. Find your next role before resigning so the gap is weeks rather than months. Most people use some combination.
- Should I include redundancy or PILON in my savings target?
- Only if it's confirmed. Expected redundancy that hasn't been formally offered shouldn't anchor the planning. PILON is confirmable once the contract is signed. Treat any uncertain income as bonus rather than baseline.
General information, not financial advice. For tailored advice on the specifics of your situation, contact MoneyHelper (free) or a regulated financial adviser.
Some links on this page are partner links. They don’t change what we recommend, and we don’t accept payment for editorial mentions. Recommendations are based on what we’d suggest anyway; the partner relationship just means we sometimes earn a small commission when you sign up.