· Built around the Emergency fund calculator
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December is when South Africans find out whether the year's saving worked: the stokvel pays out, the bonus lands, and January's bills are already in sight. Most saving goals are simple arithmetic, but nobody does the arithmetic. This post works through each one with real numbers: the emergency fund to build first, a 50/30/20 budget, what a stokvel pays out, a wedding budget, an RSA Retail Savings Bond and your net worth - the one number that shows whether it is all working.
Run your own numbers
The calculator starts on the example household: R15 000 of essential spending a month, six months of cover, R10 000 saved already and R2 000 a month going in. Change any of them.
Checked against published examples
Before publishing, CalcSA ran the same inputs through its calculators:
- RSA Retail Savings Bonds, Fixed Rate for October 2026: 8.25% for 2 years, 8.50% for 3 years, 9.00% for 5 years, minimum R1 000 - National Treasury's rsaretailbonds.gov.za, read 16 October 2026. Interest is paid on 31 March and 30 September, half the yearly rate each time, so R10 000 at 9.00% pays R450. Our retail bond calculator gives R450 and R4 500 over five years.
- Interest exemption: the first R23 800 of South African interest a year is tax-free (R34 500 from age 65) - SARS. A R10 000 bond earns R900 a year, far inside it (tax on interest).
- UIF pays 38% to 60% of pay, up to the R17 712 a month ceiling, one credit day for every four days worked - Unemployment Insurance Act 63 of 2001, section 13, as on our UIF calculator. It is why the emergency fund matters: UIF replaces part of a salary, for a while.
- Savings stokvel: 10 x R500 a month at 7%, added monthly = R5 000 x ((1 + 0.07/12)^12 - 1) / (0.07/12) = R61 963 - the standard future-value-of-deposits formula our compound interest calculator also uses. Our stokvel calculator gives R61 963 and R6 196 each.
Not verified from a primary source: no Act or regulator sets the size of an emergency fund (three to six months is a planners' rule of thumb), the 50/30/20 split (from Elizabeth Warren and Amelia Warren Tyagi's book All Your Worth, 2005, not read first-hand) or a wedding budget split - the calculators say so. The 7% stokvel rate is an example: stokvel account rates are set by each bank. Reinvested retail bond interest is compounded six-monthly here, inferred from Treasury's wording, not from a published example.
Worked example 1: a 50/30/20 budget on R20 000
- R20 000 take-home: R10 000 for needs, R6 000 for wants, R4 000 for savings and extra debt (budget calculator).
- R4 000 a month is R48 000 a year - enough to fill a six-month emergency fund for a R8 000-a-month household in one year.
- Needs at 50% is tight in South Africa. Rent of R6 500, transport R2 000 and school fees R1 500 already reach R10 000 before food. If that is you, trim wants before savings - a 60/20/20 split still saves R4 000.
- Minimum debt repayments are needs; anything above the minimum counts as savings.
Worked example 2: how big the emergency fund should be
- R15 000 of essential spending x 6 months = R90 000 (emergency fund calculator). Count rent or bond, food, transport, school fees, insurance and debt repayments - not holidays.
- R10 000 saved is 0.7 months of cover; R80 000 to go.
- At R2 000 a month that is 40 months (3.3 years). The three-month floor - R45 000 - comes first, in 18 months.
- Six months if you are the only income or on commission; three can do if two of you earn.
- Keep it where you can reach it in a day or two - a money market or notice account, not shares or a retirement fund.
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Worked example 3: what a stokvel pays out
- Savings stokvel: 10 members x R500 = R5 000 banked a month; R60 000 paid in over 12 months (stokvel calculator).
- At 7% a year, added monthly, the account holds R61 963 in December - R6 196 each. R196 each is interest; the rest is your own money back.
- Rotating stokvel: 10 members x R1 000 = a R10 000 pot each month. Everyone gets back exactly what they put in - no interest either way.
- Your turn decides who is lending to whom. Take the pot in month 3 and you have paid R2 000 before it and owe the group R7 000 after it - an interest-free loan. Take it in month 10 and you saved R9 000 for the others first.
- Write the order and the rules down, including what happens when a member stops paying.
Worked example 4: a R150 000 wedding
- R150 000 for 100 guests is R1 500 a guest (wedding budget calculator).
- Venue and catering take about 45%: R67 500, or R675 a guest. Photos and video R18 000, attire R15 000, flowers and decor R15 000, music R10 500, rings R7 500.
- Hold back 8% - R12 000 - for the extras every wedding finds.
- R30 000 saved and 12 months to go: R10 000 a month. Cutting 20 guests saves about R13 500 of venue and catering - the fastest lever there is.
- Lobola and the honeymoon are on top - budget them separately (savings goal).
Worked example 5: an RSA Retail Savings Bond
- R10 000 for 5 years at 9.00%: R450 into your bank account every six months, R4 500 in all (retail bond calculator).
- Reinvest the interest instead and it grows to R15 529.69 - R10 000 x 1.045 to the power 10.
- The 2-year bond at 8.25% pays R412.50 every six months. The rate is fixed for the whole term once you buy.
- No fees, a R1 000 minimum, and you can cash in after 12 months - for a penalty of about one interest payment.
- Locked for years, so not for the emergency fund - a home for the money after it is full.
Worked example 6: your net worth
- Home R1 500 000, cash R50 000, investments R200 000, retirement funds R800 000, cars R250 000: R2 800 000 owned (net worth calculator).
- Bond R1 100 000, car finance R180 000, cards and loans R40 000: R1 320 000 owed.
- Net worth R1 480 000 - but only R680 000 of it outside retirement funds, which are locked in until retirement under the two-pot rules.
- Every R100 owned carries R47 of debt. Work it out once a year: the direction matters more than the number.
What to do this week
- Add up your essential spending from last month's bank statement and set the emergency fund target.
- Set up a debit order for the 20% on payday, before the month gets to it.
- In a stokvel? Ask for the constitution and the bank statement - you are entitled to both.
Sources
- National Treasury, RSA Retail Savings Bonds - Fixed Rate rates for 1-31 October 2026, products and FAQ: rsaretailbonds.gov.za, read by CalcSA 16 October 2026.
- SARS, interest exemption (R23 800 a year, R34 500 from 65), 2026/27: sars.gov.za, as used across CalcSA.
- Unemployment Insurance Act 63 of 2001, section 13 - benefit rates and the R17 712 ceiling: labour.gov.za, as cited by the CalcSA UIF calculator.
- Elizabeth Warren and Amelia Warren Tyagi, All Your Worth (2005) - the 50/30/20 rule. Book not read first-hand.
Calculators used in this post
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