Savings Goal Calculator

The savings goal calculation solves for one unknown variable given the others. To find the monthly saving needed, it rearranges the future value of an annuity formula: PMT = FV x (r/12) / [((1 + r/12)^(12n) - 1)], where FV is the target amount, r is the annual interest rate, and n is the number of years. This accounts for compound interest on each monthly deposit, giving a lower required saving than simple division of target by months.

To find the time to reach a goal given a fixed monthly saving, the formula is rearranged to solve for n: n = ln(1 + FV x r / (12 x PMT)) / (12 x ln(1 + r/12)). At 0% interest, saving £500/month to reach £30,000 takes exactly 60 months. At 4% AER, compound interest reduces this to approximately 56 months, saving the equivalent of 2 months of contributions.

The calculator also handles lump sum starting balances combined with regular contributions. If you already have £5,000 saved toward a £25,000 goal, the lump sum compounds separately while monthly contributions accumulate. Inflation adjustment shows whether your target amount will have the same purchasing power by the time you reach it — a £30,000 target in 5 years needs to be £34,400 at 2.8% inflation to maintain equivalent value.

The savings goal formula. Required monthly = (target − starting balance) ÷ months, OR with interest: future value formula. FV = P × ((1+r)^n − 1)/r where P is monthly contribution, r is monthly rate, n is months. Example: save £20,000 in 5 years (60 months) at 4.5% AER = need £298/month if no starting balance. £400/month at 4.5% over 5 years = £26,800. Adjust by reverse calculation for any of: months, target, rate, starting amount.

UK best savings rates 2026. Easy access: 4.0-5.0% (Chase, Marcus, Atom). Notice (35-90 days): 4.5-5.2%. 1-year fixed: 4.5-5.5%. 2-year fixed: 4.3-5.2%. 5-year fixed: 4.0-5.0%. ISAs: same as non-ISA rates currently. Premium Bonds: average 4.15% prize rate (variable, tax-free, plus chance of £1M monthly jackpot). Regular saver accounts: 6-8% headline (best UK rates) — limit £200-£300/month, available to existing bank customers. Use comparison sites: Moneyfacts, MoneySavingExpert, Which?.

ISA vs taxable savings. Personal Savings Allowance: basic-rate taxpayers £1,000/year tax-free interest; higher rate £500; additional rate £0. ISA £20,000 annual allowance: ALL interest tax-free regardless of band. Strategy: use ISA wrapper if you'll generate £500+ interest annually OR you're additional-rate taxpayer. £20k at 4.5% = £900 interest — uses up PSA for higher-rate taxpayer. Cash ISA vs Stocks & Shares ISA: cash ISA for short-term goals (1-3 years); S&S for long-term (7+ years) — historic 5-7% real returns long-run.

Specific savings goals — typical targets. Emergency fund: 3-6 months expenses (UK avg £8,000-£15,000). House deposit (first-time buyer): £20,000-£60,000 typical (10% of £200k-£600k properties). Lifetime ISA (under 40): £4,000/year, 25% government bonus (max £1,000/year), first home or age 60. Wedding: £5,000-£25,000 depending on scale. Car: £3,000-£15,000. Holiday: £500-£3,000. Retirement top-up: state pension £230/week ≈ £12k/year — most need £20-£30k/year for comfortable retirement.

Compound growth — start early matters. £100/month at 5% for 30 years: £83,226 (you contributed £36,000, interest £47,226). £100/month at 5% for 40 years: £148,856 (contributed £48,000, interest £100,856). Delaying 10 years more than DOUBLES the interest cost of catching up. Stocks & Shares ISA historic returns 5-7% real (after inflation): same calculation gives £91,000 → £162,000. Rule of 72: years to double = 72 ÷ rate. 5% = 14.4 years; 7% = 10.3 years; 10% = 7.2 years.

The savings goal formula explained. Future value = principal × (1+r/12)^(12×n) + monthly contribution × ((1+r/12)^(12×n) − 1) / (r/12). Where r = annual rate, n = years. To find required monthly: rearrange formula. Sample: target £20,000 in 5 years, 0 starting balance, 4.5% AER → need £298/month. £400/month at 4.5% over 5 years → £26,800. Starting balance £5,000 + £200/month at 4.5% over 5 years → £19,750.

UK savings rates 2026. Easy access: 4.0-5.0% (Chase, Marcus, Atom). Notice (35-90 days): 4.5-5.2%. 1-year fixed: 4.5-5.5%. 2-year fixed: 4.3-5.2%. 5-year fixed: 4.0-5.0%. ISAs: same range as non-ISA currently. Regular savers (highest headline rates 6-8%): limited £200-£300/month max, available to existing bank customers. Premium Bonds: 4.15% average prize rate (tax-free, variable). Always check 'AER' (Annual Equivalent Rate) — compares accounts fairly.

Realistic UK savings goals by life stage. Emergency fund (priority 1): 3-6 months expenses = £8,000-£15,000 typical. House deposit FTB: £20,000-£60,000 (5-15% on £200k-£600k properties). Wedding: £5,000-£25,000. Car: £3,000-£15,000. Retirement gap: most need £20-£30k/year beyond State Pension £12k. £200/month from age 25 to 65 at 6% = £400k pension pot ≈ £16k/year drawdown. £200/month from 35 = £200k = £8k/year — 50% less for 10-year delay.

ISA strategy for savers. £20,000 annual ISA allowance. Use cash ISA for short-term goals (1-3 years); Stocks & Shares ISA for long-term (7+ years, 5-7% historic real returns). Lifetime ISA (under 40): £4,000/year, 25% bonus (max £1,000), first home (£450k cap) or age 60. Junior ISA: £9,000/year for children, locked until 18. Use it or lose it — allowance resets 6 April. Transfer between providers without losing wrapper status (use 'ISA transfer' form, never withdraw + redeposit).

Compound interest — the savings superpower. Rule of 72: years to double = 72 ÷ rate. 5% = 14.4 years; 7% = 10.3; 10% = 7.2. £100/month at 5% for 30 years: £83,226 (interest £47,226 on £36,000 invested). 40 years: £148,856. Delaying 10 years more than doubles cost of catching up. Inflation: 3%/year halves money's value in ~24 years. Real returns (after inflation) matter — cash savings barely beat inflation; investments historically 5-7% real over 10+ year horizons.