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
A fixed deposit is a bank deposit with a rate fixed for the tenor and NDIC cover up to the per-depositor limit. A money market fund is an SEC-registered unit trust investing in short-term instruments, with a yield that moves daily, no guaranteed return and no NDIC cover, but usually easier access: ARM's fund, for example, says redemptions should take no more than one working day.
Both are popular homes for naira savings that need to be safe-ish and reachable within months. They are often compared as if they were the same product with different rates. They are not: one is a debt the bank owes you, the other is a share of a pool of investments run by a fund manager. That difference explains most of how they behave.
Side by side
| Fixed deposit | Money market fund | |
|---|---|---|
| What you own | A deposit the bank must repay | Units in a fund |
| Regulator | CBN (bank) | SEC (fund manager and fund) |
| Return | Rate agreed at booking, fixed for the tenor | Yield that moves with the fund's holdings |
| Access | At maturity; penalty to break early | Redemption on request, subject to fund rules |
| Deposit insurance | NDIC up to the per-depositor limit | None: not a deposit |
| Costs | Usually none beyond tax; penalty if broken | Management fee and other expenses inside the fund |
| Tax on interest | 10% withholding tax, final for individuals | Check the fund's documents |
How a money market fund works
ARM's Money Market Fund factsheet for September 2025 is a useful example. It describes an SEC-registered unit trust investing in government securities (37.75% of the fund at the time) and other short-term instruments (62.25%), benchmarked against the average 91-day Treasury bill stop rate. It lists a minimum investment of ₦1,000, a management fee of 1.5% of net asset value, a total expense ratio of 2.05% year to date, and a 90-day minimum holding period. ARM's FAQ says there is no guaranteed return and that redemption "should not exceed one working day" after the request is received. Other funds set different terms; read the factsheet of any fund you consider. See how money market funds work.
The four differences that matter
Liquidity
A fixed deposit is locked until maturity; leaving early costs interest, as Standard Chartered Nigeria's 20%-or-more forfeit illustrates. A money market fund can usually be redeemed at any time, but read the small print on timing. ARM's factsheet lists a 90-day minimum holding period, and its FAQ says that a partial redemption before the end of a quarter returns your capital, with the income paid at the next quarterly distribution. Other funds have their own rules.
Rate behaviour
A fixed deposit rate is locked when you book. A money market fund's yield follows the instruments it holds, so it rises and falls with Treasury bill and money market rates while you are invested. When rates are falling, a deposit booked earlier can out-earn a fund; when rates are rising, the fund often catches up faster.
Protection
The NDIC's FAQ sets cover at ₦5,000,000 per depositor at commercial banks and ₦2,000,000 at microfinance banks, including accrued interest. A money market fund is not a deposit, so NDIC cover does not apply. Its protection comes from SEC regulation, an independent trustee and a custodian holding the assets; ARM's factsheet names First Trustees Nigeria as trustee. The fund's value can in principle fall, although money market funds hold short-term, lower-risk instruments.
Tax
On a fixed deposit, BusinessDay reported in February 2026 that banks deduct 10% withholding tax from interest and that it is final for individuals. How tax applies inside a money market fund and on its distributions depends on the fund and the instruments it holds; we could not confirm a single rule, so check the fund's prospectus or ask the manager. This is information, not tax advice.
A worked comparison
Example only, with assumed rates. ₦1,000,000 for 180 days. Fixed deposit at 15%: ₦1,000,000 × 0.15 × 180 ÷ 365 = ₦73,972.60 gross, ₦66,575.34 after 10% tax. Money market fund with an assumed average net yield of 15% after fees over the period: about ₦73,972.60 before any tax at fund or investor level. If the fund's yield averaged 13% instead, the figure falls to ₦64,109.59. The fund wins on access; the deposit wins on certainty.
Questions to ask before choosing
- When might I need this money, and how quickly?
- Do I want a fixed figure, or am I comfortable with a yield that moves?
- How much of my total is within NDIC cover at each bank I use?
- For a fund: who is the manager, trustee and custodian, what are the total expenses, and is there a minimum holding period?
- For a deposit: what is the rate, day count and early-liquidation penalty?
Which suits what
- Fixed deposit: money with a known date, where you want a fixed figure and NDIC cover.
- Money market fund: an emergency reserve or money you may need at short notice, accepting a floating yield.
- Both: many savers keep a reserve in a fund and lock longer-term money in deposits. See fixed deposit vs savings account.
Where Pryme fits
Pryme Savings Boxes are naira deposit products: a Flexible Box for access, a Fixed Box for a locked term, with rates shown in the app. Pryme does not offer a money market fund. See Savings Boxes.
Questions people ask
Which is better, fixed deposit or money market fund?
Neither is better in every case. A fixed deposit gives a fixed rate and NDIC cover but locks your money; a money market fund gives easier access and a floating yield, without NDIC cover.
Is a money market fund insured by NDIC?
No. It is an investment fund, not a bank deposit. It is regulated by the SEC, with a trustee and custodian holding the assets.
Can I lose money in a money market fund in Nigeria?
It is possible in principle, as returns are not guaranteed, though funds hold short-term, lower-risk instruments. Read the fund's factsheet and risk disclosures.
How fast can I withdraw from a money market fund?
It depends on the fund. ARM says redemption should not exceed one working day after the request. Some funds have minimum holding periods.
Sources
- ARM Money Market Fund factsheet (September 2025) · accessed Oct 2026
- ARM Investment Managers: FAQs · accessed Oct 2026
- NDIC: Frequently Asked Questions · accessed Oct 2026
- BusinessDay: Why was withholding tax deducted from savings interest (21 Feb 2026) · accessed Oct 2026
- Standard Chartered Nigeria: Fixed Deposit Account (undated product page) · 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.