AI agents for business finance: what they can and can't do
What AI agents can do in bookkeeping, close, collections and compliance today, where a person must stay in charge, and how to judge a product.
The short answer
Take the goal's cost on the date you will need it, add a buffer for price rises, subtract what you have already saved, and divide by the number of paydays left. Recalculate whenever you fall behind or the price changes, so the monthly figure always reflects what is still needed.
The formula
Every savings goal, from a phone to a year's rent, can be turned into a monthly amount with one line of arithmetic.
- Goal cost
- What the thing costs today, including fees, delivery and extras, not only the headline price.
- Buffer
- An allowance for prices rising before you buy, plus a margin for surprises.
- Already saved
- Money already set aside for this goal, and only this goal.
- Paydays left
- The number of income dates before you need the money, not calendar months.
Choosing the buffer
The buffer protects you from finding that the goal has become more expensive by the time you are ready. NBS figures put headline inflation at 14.63% for September 2026 and food inflation at 19.59%, but different goals rise at different speeds.
| Goal timeline | Suggested buffer (rule of thumb) | Why |
|---|---|---|
| Under 6 months | 5% | Little time for prices to move |
| 6 to 12 months | 10% | Roughly matches a year of moderate price rises |
| 1 to 3 years | 15 to 25% | Prices compound over time |
| Imported items, any timeline | Add 5 to 10% more | Prices follow the exchange rate |
These are rules of thumb, not forecasts. If you know the actual increase, such as a landlord's or school's new figure, use that instead.
Worked example
An example saver wants ₦1,500,000 for a goal in ten months and has ₦200,000 already set aside.
| Step (example) | Amount |
|---|---|
| Goal cost today | ₦1,500,000 |
| Add 10% buffer | ₦150,000 |
| Total needed | ₦1,650,000 |
| Less already saved | ₦200,000 |
| Still to save | ₦1,450,000 |
| Paydays left | 10 |
| Monthly saving | ₦145,000 |
What to do when you fall behind
Most plans slip at some point. The fix is to recalculate, not to give up. Suppose the example saver only managed ₦120,000 a month for the first four months.
| Step (example) | Amount |
|---|---|
| Saved so far: ₦200,000 + 4 × ₦120,000 | ₦680,000 |
| Still needed | ₦970,000 |
| Paydays left | 6 |
| New monthly saving | about ₦161,700 |
If the new figure is not possible, you have four honest levers:
- Move the date. Two more paydays at the old rate may be enough.
- Lower the cost. A cheaper option, a smaller event or a second-hand item.
- Find money elsewhere. Put a bonus, a gift or the sale of something you no longer use straight into the pot.
- Cut another goal's pace, temporarily and on purpose, but never your emergency fund.
Why borrowing the gap usually makes it worse
When a goal date arrives and the pot is short, borrowing the difference can look like the easy option. But the cost of credit in Nigeria is high; the CBN set the Monetary Policy Rate at 23% at its September 2026 meeting, and lenders price consumer credit above that. A shortfall of ₦200,000 borrowed for a few months becomes a larger amount to repay, and it reduces what you can save for the next goal. Recalculating early, while there is still time to use the four levers, is almost always cheaper than borrowing late.
Several goals at once
Use the formula for each goal separately, then add the monthly figures together. If the total is more than you can save, rank the goals by date and by how unavoidable they are. Fixed-date essentials such as rent and school fees come first; flexible goals such as a gadget or a holiday adjust. Our guide on separate savings pots sets out a sensible order, and saving for a year's rent shows the method on the largest goal most households face.
If your income is irregular
Convert the monthly figure into a share of income. If you expect to earn about ₦600,000 a month on average and need ₦145,000, that is about 24% of each payment. Save that share from every payment as it arrives, and check the balance against the target at the end of each month.
Make the check a habit
Set one date a month, ideally the day after payday, to check each goal against the formula. Write down three numbers for each: needed, saved and paydays left. If the monthly figure has moved by more than a tenth, decide which lever to pull that day rather than waiting.
Should interest count?
Interest helps, but in a high-inflation period it rarely covers price rises on its own, and it may be reduced by tax. A cautious approach is to ignore interest in the formula and treat it as a bonus that builds your buffer. See real returns in Nigeria.
Where Pryme fits
In the Pryme app each goal can live in its own naira Savings Box, so the already-saved figure for every goal is always visible. Rates are shown in the app before you commit. Your Personal Assistant, named Eva by default, can remind you on payday and prepare the transfer into each Box, but nothing moves without your approval.
Questions people ask
How do I calculate how much to save per month?
Add a buffer to the goal's cost, subtract what you have saved, and divide by the paydays left before you need the money.
How much should I add for inflation when saving?
As a rule of thumb, about 5% for goals under six months, 10% for six to twelve months and more for longer goals or imported items.
What if I can't save the monthly amount?
Recalculate, then move the date, lower the cost, add windfalls, or slow a flexible goal. Avoid raiding your emergency fund.
How do I save with irregular income?
Turn the monthly figure into a percentage of your average income and save that share from every payment as it arrives.
Sources
- NBS September 2026 CPI: inflation drops to 14.63% (Technext report) · accessed Oct 2026
- Central Bank of Nigeria: Monetary Policy Committee decisions · accessed Oct 2026
This article is general information, not financial, legal or tax advice. Products described are provided under the terms on this site and are subject to regulation and eligibility.