Finance

Investment Savings Goal Monthly Deposit Calculator (30 Years)

Find the monthly deposit needed to reach a savings goal. This investment version uses a 30-year planning term as its starting point.

Interpretation: the Monthly deposit figure is the fixed amount to save every month for 30 years, or 360 monthly deposits, at the annual rate entered, so that those deposits plus assumed growth reach the goal amount; a lower real rate would leave the same monthly deposit short of the goal, and missing deposits would leave it shorter still.

Formula

Monthly deposit equals goal times monthly rate divided by one plus monthly rate to the power of months minus one.

How it works

Saving a fixed amount each month with interest reaches the goal faster than saving without interest.

Worked example

Goal amount $50,000, annual rate 5%, term 30 years. The monthly rate is 5% divided by 12, which is about 0.4167% a month, and the number of deposits is 30 times 12, which is 360 months. Using the page formula, the monthly deposit is $50,000 times the monthly rate, divided by one plus the monthly rate to the power of 360, minus one, which gives $60.08 a month. That is the calculator output for these defaults. Over the term the deposits total $21627.89, so growth covers $28372.11 of the $50,000 goal. Without any interest the same goal would need $138.89 a month, so interest saves about $78.81 a month on average at the assumed rate. The 5% rate is only the entered assumption; a lower real average return would leave the same deposit short of the goal.

Who this term suits for an investor: an investor saving across a working career toward retirement or a legacy portfolio — the deposit is the smallest burden in this group so far, but the goal amount itself will almost certainly need raising as real investment costs change.

FAQs

How much should I save each month?
Divide the goal by the growth of regular deposits at the assumed rate to get the monthly amount.

Is this investment calculator exact?
No, it is an estimate for planning only, based on the numbers you enter.

Are these figures financial advice?
No, they are estimates for planning only, not financial advice. Check with a qualified adviser for decisions involving large sums.

Why does the 30-year deposit fall to $60.08 a month?
Because 360 months of compounding cover most of the goal: deposits total $21,627.89 while growth covers $28,372.11, more than the deposits themselves.

Can a $50,000 goal still fund an investment in 30 years?
Probably not on its own: prices and investment minimums will have changed, so revisit the goal amount itself, not just the monthly deposit, as the years pass.

What should an investor do if the money is needed early?
Take only what is needed and keep the rest invested if possible: withdrawing early ends compounding on that money and can also trigger fees or taxes.

Estimates only, not financial advice. Figures are approximate and do not include all fees, taxes, or changing rates unless stated.