Planning Backwards: From Goal to Monthly Amount
Most calculators answer “what will my money become?”. Goal planning inverts the question: fix the destination — a house deposit, school fees, a car, a retirement cushion — and solve for the contribution that gets you there. The planner runs both directions of that maths: the required monthly investment target × r ÷ ((1 + r)ⁿ − 1) and the required lump sum today target ÷ (1 + rate)ʸ.
A Worked Example: ₦10,000,000.00 in 5 Years
Suppose the goal is ₦10,000,000.00 in 5 years, invested at the current 2-year FGN Savings Bond coupon rate of 14.72% p.a. (the July 2026 DMO offer, tax-exempt). The planner's engine gives two routes: invest ₦113,777.82 every month, or place a single ₦5,033,615.33 today and let compounding do the rest. Both assume the rate holds and coupons are reinvested at the same rate — real outcomes will vary as rates move, which is why the planner recalculates from live figures every time you use it.
Matching the Instrument to the Horizon
- —Under 1 year: Treasury Bills or a money market fund — short tenors, high liquidity, currently quoting around 17.66% (364-day NTB, gross).
- —2–3 years: FGN Savings Bonds — fixed quarterly coupons, tax-exempt, from ₦5,000, aligned to medium-term goals.
- —Longer horizons: mutual funds can target higher growth in exchange for year-to-year variability — returns are not fixed or promised.
Frequently Asked Questions
How does the goal planner work out my required monthly investment?
It uses the standard future-value-of-annuity formula: required monthly = target × r ÷ ((1 + r)^n − 1), where r is the monthly rate and n the number of months. It answers the question in reverse — instead of “what will my money grow to?”, it asks “how much must I invest to hit a specific target?”
Should I plan with a lump sum or monthly contributions?
Whichever matches your cash flow — the planner computes both. A lump sum benefits from compounding over the full period so the required amount is lower in total; monthly contributions spread the burden and suit salary earners. Many savers combine the two.
Which Nigerian instrument should I plan my goal around?
Broadly by horizon: goals inside a year fit Treasury Bills or money market funds; two-to-three-year goals fit FGN Savings Bonds with their fixed quarterly coupons; longer horizons can justify mutual funds, accepting more variability. The planner lets you test any rate, and each instrument’s calculator page details its risk profile.
Does the planner account for tax and inflation?
The projection uses the gross rate you select — withholding tax (where it applies) and inflation will reduce the real outcome. For an after-tax view use the instrument’s own calculator, and use the Inflation Adjuster to see targets in purchasing-power terms. Setting a slightly higher target than the raw goal builds in a margin.
What if rates change during my plan?
They will — the calculation assumes the chosen rate holds, which no rate does for years at a stretch. Revisit the plan when you reinvest maturing instruments: if rates have fallen, either the monthly amount rises or the timeline stretches. Planning with a conservative rate keeps surprises pleasant.
Projections are illustrative, use the gross rate selected, and assume it holds for the full period. They are not a promise of future returns and not personal financial advice.