How Much Loan Can I Afford? A Practical Guide for Kenyan Borrowers

“How much loan can I afford?” is the most important question to ask before you borrow, and it is one that too few borrowers ask of themselves. Lenders will assess affordability too, but their job is to decide whether to lend. Your job is to decide whether the loan will leave you better off, and whether you can repay it without strain if things do not go to plan.

This guide gives you a simple method for working out a safe monthly instalment from your own income and expenses, explains the debt-service ratio lenders use, shows why buffers matter, and walks through a worked example using a flat 4% per month rate.

How much loan can I afford? Start with the instalment

Most people begin with the amount they need: KES 300,000 for stock, a car repair or school fees. A better starting point is the instalment you can afford each month. Once you know that figure, you can work backwards to the loan amount and term that fits it. If the amount you need does not fit, you have learned something valuable before signing anything.

Step 1: Work out your reliable monthly income

Use income you can count on, not your best month.

• Salaried borrowers: use your net pay, after PAYE, statutory deductions and any existing payroll deductions.
• Self-employed and business owners: look at your M-PESA and bank statements over the last six to twelve months and use a typical month, or the average of your weaker months if income is seasonal. Our guide on using your M-PESA statement in a loan application explains what lenders look for.
• Mixed income: count only income that is regular. Occasional side income is a bonus, not a basis for a monthly commitment.

Step 2: List your essential monthly costs

Write down everything that must be paid every month: rent or mortgage, food, transport, utilities, school fees (averaged monthly), insurance, support for family members, and business running costs if the business pays you. Be honest. Underestimating your expenses is the most common reason affordable-looking loans become difficult.

Step 3: Add up your existing debt repayments

Include every loan: bank, SACCO, mobile loans, hire purchase, check-off deductions and credit cards. Use the monthly amount you actually pay. If you have short-term mobile loans that you roll over, include the amount you typically repay in a month.

Step 4: Understand the debt-service ratio

Your debt-service ratio is the share of your income that goes towards loan repayments:

Debt-service ratio = total monthly loan repayments ÷ net monthly income

Example: if your net income is KES 120,000 and you pay KES 30,000 a month towards loans, your ratio is 25%.

There is no single official limit that applies to every borrower in Kenya. Each lender sets its own affordability criteria, and the right level for you depends on how much of your income is already committed to essentials. As a general principle, the lower the ratio the more resilient you are. A borrower who spends most of their income on fixed essentials has far less room for loan repayments than one with low living costs, even on the same salary.

For salaried employees, Kenyan employment law also places a ceiling on payroll deductions: under the Employment Act, total deductions an employer makes from wages at any one time should not exceed two-thirds of those wages. That is a legal maximum for deductions, not a recommended borrowing level. Our guide to check-off loans explains how this affects salary-deducted borrowing.

Step 5: Keep a buffer

A loan that only just fits your budget is not affordable, because something always comes up: a medical bill, a slow month in the business, a car repair. Before settling on an instalment, set aside:

• A monthly margin. After essentials, existing debts and the new instalment, you should still have money left over each month, not zero.
• An emergency fund. Cash you can reach quickly, so a surprise cost does not force you to miss a repayment or take a short-term loan. Our guide to emergency loans explains why a buffer usually beats borrowing in a crisis.
• Room for rising costs. Fuel, food and school fees rarely fall over a two- or three-year loan term.

Step 6: Calculate your maximum safe instalment

Put it together:

Safe instalment = net income − essential costs − existing loan repayments − monthly buffer

Whatever is left is the most you should commit to a new loan each month. If the figure is small or negative, the honest answer to “how much loan can I afford?” is “not much right now”, and the better plan may be to reduce existing debt first. Our guide to debt consolidation covers one way to do that.

A worked example using a flat 4% per month

Example: Wanjiku, a hypothetical business owner, has a typical net monthly income of KES 150,000. Her figures look like this:

Item	Monthly amount (KES)
Net income	150,000
Essential living and business costs	85,000
Existing loan repayments	15,000
Monthly buffer she wants to keep	10,000
Maximum safe new instalment	40,000

She is considering a loan of KES 300,000 over 12 months at a fixed 4% per month, calculated flat on the amount advanced:

• Interest: KES 300,000 × 4% × 12 months = KES 144,000
• Total repayable: KES 300,000 + KES 144,000 = KES 444,000
• Monthly instalment: KES 444,000 ÷ 12 = KES 37,000

The instalment of KES 37,000 sits below her safe maximum of KES 40,000, leaving her a margin of KES 3,000 on top of the buffer she has already set aside. Her total loan repayments would be KES 52,000 a month (KES 15,000 existing plus KES 37,000 new), a debt-service ratio of about 35%.

The loan fits, but not by much. She might consider a slightly smaller amount, or ask whether she really needs the full KES 300,000. Before applying, she should also add the application fee and, for a secured loan, the valuation fee and insurance, all of which appear in the written offer. You can run your own figures through our loan calculator, which shows the instalment and total repayable for any amount and term.

Longer term, lower instalment, higher cost

If the instalment for the amount you want is too high, the obvious fix is a longer term. On a flat-rate loan, every extra month adds interest on the full amount advanced. Using the same rate, KES 300,000 over 24 months carries KES 288,000 of interest, a total of KES 588,000 and an instalment of KES 24,500. The monthly payment is lower, but you pay twice the interest.

Choose the shortest term whose instalment you can carry comfortably, not the longest available. Our guide to how loan interest rates work explains flat and reducing-balance pricing in more detail.

How lenders assess affordability

A responsible lender will look at many of the same things you have just worked through: your income and its stability, existing commitments, your CRB record and, for secured loans, the value of the asset. For logbook loans, Aspire lends up to 60% of the vehicle’s assessed value, but the asset value is a ceiling, not a target. The amount you are offered must also fit your income.

If you want to see where you stand before applying, our eligibility page sets out the basic requirements, and our product comparison shows how each Aspire product is structured. Reading the loan application checklist first helps you gather the right documents.

Signs you are borrowing more than you can afford

• You need a loan to make the repayments on another loan.
• Your plan only works if your income rises or a large payment arrives on time.
• You have nothing left over after the instalment in a typical month.
• You are choosing the longest term just to make the instalment fit.
• You would have to stop saving entirely.

If any of these apply, step back. It is far easier to borrow a smaller amount now and borrow again later than to recover from a missed repayment. Our guide on common borrowing mistakes covers more warning signs.

Borrowing for a business: check the return

If the loan is for a business purpose, such as stock or equipment, add one more test: will the loan generate enough extra income to cover its own instalment? If new stock will produce KES 50,000 of additional profit a month and the instalment is KES 37,000, the loan pays for itself with room to spare. If the return is uncertain or slow, base your affordability on your existing income alone.

The bottom line

The answer to “how much loan can I afford?” starts with your reliable income, your real expenses and your existing debts, and it must leave room for a buffer. Work out your maximum safe instalment first, then choose the smallest loan and shortest term that fit inside it. Check the total repayable, not just the monthly figure, and read every charge in the written offer before you sign.

Frequently asked questions

How much loan can I afford on my salary?

Take your net pay, subtract essential costs, existing loan repayments and a monthly buffer. What remains is the most you should commit to a new instalment each month.

What is a debt-service ratio?

It is the share of your net income that goes to loan repayments each month. A lower ratio leaves more room for living costs and unexpected expenses.

Is there a legal limit on salary deductions in Kenya?

Under the Employment Act, total deductions from an employee's wages at any one time should not exceed two-thirds of those wages. This is a legal ceiling, not a recommended borrowing level.

What would KES 300,000 over 12 months cost at 4% per month flat?

Interest would be KES 144,000, the total repayable KES 444,000 and the monthly instalment KES 37,000, before any fees set out in the written offer.

Should I choose a longer term to lower my instalment?

Only if you need to. A longer term lowers each payment but increases the total interest, so choose the shortest term you can comfortably afford.