Keeping MYR6,000 costs more modeled interest but preserves cash. Two months of assumed spending is a description of this example, not a universal reserve target.
Make the bonus a separate one-time decision
Assume a fictional borrower receives MYR10,000 available cash after any obligations already assigned to it. Existing debts are Card MYR5,000 at 18% APR with MYR250 minimum, Personal MYR15,000 at 8% with MYR400 minimum, and Small MYR2,000 at 0% with MYR100 minimum. Regular repayments remain MYR750 monthly in every comparison.
One case sends the full MYR10,000 into the month-one lump sum. A second sends MYR4,000 and retains MYR6,000 as accessible cash outside the debt tool. The no-bonus case is the reference. None assumes a recurring monthly extra payment or a future bonus.
Give the retained cash an explicit job
Assume essential household spending is MYR3,000 per month and there is no other reserve in this deliberately narrow exercise. MYR6,000 divided by MYR3,000 is two months. The measure excludes additional shocks and changes in income. If that spending figure omits required debt payments, add those obligations before using the same division for your own runway.
The CFPB discusses saving for unexpected expenses; it does not prescribe this MYR6,000 allocation. List what would actually call on the reserve: an interruption in pay, an urgent repair or an already known bill. Known bills need their own provision rather than being quietly counted as spare emergency cash.
Background source: CFPB: emergency saving principles (US background only)
Read the debt price of each allocation
Without a lump sum, avalanche takes 34 months with MYR3,038.87 interest. A MYR4,000 lump sum reduces that to 27 months and MYR1,620.33. A MYR10,000 lump sum produces 17 months and MYR706.89. Retaining MYR6,000 therefore leaves MYR913.44 more modeled interest than the all-debt case, while preserving that cash at the start.
Snowball gives 27 months and MYR1,871.69 for the split, versus 18 months and MYR838.04 for all-debt. These are separate modeled paths. Do not subtract a hypothetical return on the reserve unless you explicitly state and calculate it; this comparison assumes no reserve earnings.
| Bonus allocation | Avalanche payoff / interest | Cash retained from bonus |
|---|---|---|
| No bonus used | 34 months / MYR3,038.87 | Outside this comparison |
| MYR4,000 to debt | 27 months / MYR1,620.33 | MYR6,000 |
| MYR10,000 to debt | 17 months / MYR706.89 | MYR0 |
Distinguish interest cost from access to money
The all-debt case wins this limited interest comparison, but money paid to a lender is no longer automatically accessible cash. A lower card balance is not the same thing as a reserve you control, and future access to credit is not assured. The tool cannot value a household’s discomfort with that dependence.
Conversely, retaining money has a measurable debt cost in this example. Do not describe the buffer as free protection. Write both consequences beside each other: modeled interest and cash retained. The decision then has visible tradeoffs instead of implying that the lowest interest number answers every household concern.
Check the first-month convention and omitted risks
In this engine, opening balances accrue one month of APR/12 interest before required payments and the one-time extra are allocated. The MYR10,000 is not assumed to arrive before that first interest charge. Changing the actual receipt date or lender posting rules can change the result. All monetary debt rows are rounded to cents.
The model omits daily accrual, changing minimums, penalty fees and early-settlement conditions. It also does not simulate a later emergency that forces new borrowing. For that possibility, write a separate cash budget and inspect actual contractual options; do not disguise an unsupported event as part of this payoff schedule.
Compare three saved scenarios and a separate reserve note
Load the debt example book, identify the baseline and the two bonus entries, and compare both strategies. Check that extra monthly payment stays zero and the fixed monthly budget remains MYR750. Keep the MYR6,000 reserve note outside the debt input; the planner does not maintain an emergency-fund account.
Before choosing an allocation, list near-term bills, available reserves and what would happen if income stopped. Record a review date after the bonus arrives. This exercise supplies an arithmetic comparison and a way to organise the decision, without turning either allocation into advice for an unknown household.
The JSON download is a fictional example book for this tool only. Before importing, export a backup of your existing local book. Read the import preview, check the tool and entries, and confirm only if you intend to replace the current book; importing is not a merge. Keep your backup separately. The companion CSV is a manual comparison worksheet, not an import file. Downloads do not connect to your accounts or sync devices.
Download the example book and manual comparison
Put it into practice
Compare both lump sums and record the reserve purpose beside the debt result.
Open the decision tool