Why a Korean apartment repair plan needs a funding ledger
A Korean apartment long-term repair reserve prepares shared funds for major common facilities such as elevators, roofs and pipes.
When several works are scheduled, comparing the total repair budget with average monthly deposits can miss a shortage at an earlier payment date.
Roof waterproofing may use the available reserve before an elevator payment comes due, even when later contributions eventually rebuild the balance.
This calculator connects the available opening reserve, whole-complex monthly deposits and dated work payments in one shared monthly ledger.
It identifies the first shortfall month, peak cumulative funding gap, minimum constant monthly deposits that meet every payment checkpoint, and an illustrative unit share.
Its purpose differs from a tenant’s refund of past reserve payments or the lifetime cost of one installation: it reviews liquidity across multiple works drawing on the same fund.
Use it before these decisions
- Owners and residents preparing an owners’ council discussion about contributions before planned works.
- Management reconciling available bank funds with the actual repair-plan payment schedule.
- A complex preparing a funding review to explain the risk of sudden additional contributions.
2026 Korean rules and the boundary of this estimate
Planning, collection and use
Article 29 of the Joint Housing Management Act governs long-term repair plans for common parts of qualifying housing.
The plan must be reviewed every three years and adjusted when necessary; the statutory written-consent conditions also matter for an adjustment before three years have passed.
Article 30 places reserve collection on owners and connects use of the reserve to the repair plan.
Complex-specific rates and procedures
Enforcement Decree Article 31(1) connects the rate to management rules and the durability of common facilities; paragraph (4) places the reserve amount in the long-term plan.
Under Article 31(5), management prepares a spending plan and obtains the owners’ council resolution for use.
The calculated result cannot establish a nationwide tariff or authorize an increase without the relevant procedures.
A liquidity minimum is not a statutory billed charge
This Korea-specific 2026 estimate uses opening money and entered payment dates to calculate a budget minimum.
It does not replace the Article 31(3) unit-charge formula, management rules, the approved contribution plan, contractor selection or spending resolutions.
Enforcement Rule Article 7 and Annex 1 govern plan standards and adjustment procedures; an annex repair percentage is not a unit’s payment share or a quote discount.
The model does not determine construction necessity, compliance, or whether a particular expense may legally use the reserve.
Prepare the balance, work and receipt evidence
Opening funds and whole-complex deposits
Use the available reserve immediately before the first day of the analysis month as the opening balance.
Payments and receipts that already occurred belong in that balance and must not be entered again.
Monthly contributions mean the expected amount actually deposited across the complex, not one unit’s billed charge; reconcile arrears or timing differences with the real cash assumption.
Keep unknown amounts blank and enter 0 only when zero has been verified.
Work payments and quote price date
Enter the work name, expected payment month and total actual cash payment together.
Confirm whether VAT, design, supervision and other applicable costs are included, and count each cost only once.
Split an advance, progress payment and final settlement into separate monthly rows when the contract has several payment dates.
Growth scenarios treat quotes as first-analysis-month prices; use 0% if a quote already fixes the future payment price.
Verified net interest and non-borrowed funding
The receipt ledger accepts a dated verified net-interest amount or non-borrowed funding.
It does not invent future rates or automatically earn interest on projected balances, and an uncertain grant is not available cash.
Loans need repayment, interest and approval conditions that this model does not include, so exclude loan proceeds.
Do not enter money again if it is already part of opening funds or the monthly contribution.
Monthly balances and the minimum contribution formula
Balance recurrence and cost growth
Closing balance = previous closing balance + monthly contribution + other receipts − work payments
Projected work cost = base quote × (1 + annual growth ÷ 100)months from start to payment ÷ 12
All work payments in one month are added together and deducted from a single shared reserve.
The first month has a growth offset of zero, and budget costs round up to whole KRW.
Opening funds are never allocated repeatedly to each work item; earlier receipts and payments remain in the cumulative ledger.
Every cumulative payment checkpoint matters
After-receipt payment: monthly deposits ≥ (cumulative costs − opening funds − cumulative other receipts) ÷ elapsed months
Check every prefix from month 1 to the final month, take the largest required value or zero, and round up to whole KRW.
This tests whether an earlier large payment can be funded rather than dividing total work cost by the full analysis period.
The additional monthly amount is the larger of zero and the minimum minus the current monthly contribution.
If present contributions already exceed the minimum, no increase is required by this entered scenario.
First and peak shortfalls
The first shortage month is the first month with a payment-time or closing balance strictly below zero.
The peak gap is the deficit at the lowest checkpoint, not the sum of each month’s shortage.
A zero balance leaves no spare cash but has no unmet scheduled payment, so it is not classified as a shortfall.
A negative projection is a cumulative unmet funding need, not an actual deposit balance or automatic borrowing.
Before-receipt payments and immediate first-month funding
If monthly deposits arrive at the end of the month but an advance is due at its start, the closing balance alone can hide a payment problem.
Choose payment before contributions and receipts to deduct the month’s works from funds accumulated through the preceding month, then add later receipts.
A payment in month m can use only m−1 earlier monthly deposits and excludes that month’s other receipts at the payment checkpoint.
There is no prior deposit opportunity in the first month
With zero opening funds and a KRW 1,000,000 payment before deposits in month 1, a KRW 1,000,000 monthly contribution still leaves a KRW 1,000,000 payment-time gap.
The calculator withholds a monthly-only solution for the original opening balance and reports KRW 1,000,000 of immediate funding needed before starting.
It separately computes the minimum monthly amount after assuming those immediate funds have been secured, so both requirements must be considered.
If payment instead follows deposits and no other work is scheduled, KRW 1,000,000 of monthly deposits covers the payment and closes that month at zero.
How to produce an owners’ council review
- Select the first month and horizon.
Match the opening-balance date and choose the period being reviewed from the verified plan.
- Reconcile the bank and contribution records.
Enter whole-complex available funds and deposits, and choose before-receipt timing if payments arrive earlier than funding.
- Enter work payments by month.
Add roof, elevator, pipe and other planned totals; split staged payments across their contractual months.
- Add verified receipts and the allocation basis.
Date net interest and non-borrowed funding, and use consistent supply-area inputs for unit allocation.
- Read shortfall timing and required deposits together.
Review the lowest balance, yearly ledger, excluded items and immediate first-month funding alongside the final balance.
- Save the review and reconcile the documents.
Keep the TXT ledger or printed result with its inputs, payment order and growth assumption; review contribution adjustments through management and the owners’ council procedures.
Fictional example: an earlier payment sets the minimum
These amounts demonstrate arithmetic and are not market prices or recommended repair budgets.
Start in October 2026, analyse 24 months, and enter KRW 10,000,000 of opening funds, KRW 500,000 in monthly deposits, 0% growth and payments after receipts.
Schedule KRW 20,000,000 for roof waterproofing in September 2027 and KRW 5,000,000 for elevator work in September 2028.
Major payment months and closing balances in the fictional multi-work plan| Checkpoint | Work payment | Closing balance |
|---|
| 2027-09 · month 12 | KRW 20,000,000 | −KRW 4,000,000 |
| 2028-09 · month 24 | KRW 5,000,000 | −KRW 3,000,000 |
First and peak shortfall
The first shortfall occurs in September 2027, with a peak cumulative funding gap of KRW 4,000,000.
Later deposits reduce part of that gap but do not fund the earlier payment deadline.
Adding both displayed deficits into a KRW 7,000,000 requirement would count the cumulative gap twice.
Minimum and additional monthly amount
The roof constraint is KRW 10,000,000 ÷ 12 months; the full-plan constraint is KRW 15,000,000 ÷ 24 months.
Rounding the larger constraint gives KRW 833,334 in minimum monthly deposits and KRW 333,334 more than the current amount.
Applying that monthly amount keeps every checkpoint non-negative, with a lowest balance of KRW 8.
Change the same schedule to payment before receipts and only 11 deposits are available before the roof payment, increasing the minimum to KRW 909,091.
At the original KRW 500,000 monthly amount, the peak gap becomes KRW 4,500,000; reconcile the within-month order with actual payment and deposit dates.
Supply-area allocation and the statutory formula
The statutory supply-area basis
Monthly reserve per unit = [total repairs over the plan ÷ (total supply area × 12 × plan years)] × unit housing supply area
This is the structure verified in Enforcement Decree Article 31(3).
The calculator’s area allocation applies a unit’s supply-area share to the complex monthly budget derived from liquidity checkpoints; it does not recalculate the statutory bill.
A funding minimum that uses opening reserves and payment dates is not the same input as total repair cost in the statutory formula.
For a fictional total supply area of 30,000 m² and representative unit supply area of 85 m², the KRW 833,334 minimum gives a rounded illustrative unit share of KRW 2,362.
The KRW 333,334 increase gives KRW 945 for that unit.
An equal-share assumption across 300 units instead gives KRW 2,778 minimum and KRW 1,112 additional per unit; it is not the statutory supply-area billing method.
If allocation inputs are unknown, whole-complex results remain available while unit amounts are withheld.
Do not insert an exclusive-area label such as 84 m² without confirming the corresponding housing supply area and a matching complex total.
Summing individually rounded unit amounts can exceed the complex total, so management must reconcile actual allocation and rounding with its documents.
Read yearly ledgers, exclusions and delay scenarios carefully
Calendar-year ledger
The yearly table shows opening funds, contributions, other receipts, work payments, the closing balance and the lowest checkpoint in that year.
Starting in October produces a three-month first calendar year, not a full year.
Expand the monthly ledger and check payment-time balances to distinguish the month of a large cost from a later recovery.
Items beyond the horizon
Payments from the month after the final included month are retained as excluded items and are not deducted in this period.
Receipts use the same period boundary, while earlier entries are rejected to avoid duplicating opening money.
A no-shortfall result for included works cannot establish that the entire approved long-term plan has enough funding.
Delaying a cost does not remove it
The comparison shifts every work payment by the selected delay while keeping receipt dates, opening funds, contributions and the horizon unchanged.
If growth is positive, costs are recalculated using the new payment month.
In the example, a 12-month delay moves roof work to September 2028 and elevator work beyond the horizon, reducing the included-period minimum to KRW 416,667.
This does not save the elevator cost: extend the horizon and separately confirm equipment safety, approvals and contractual payment terms.
Practical review scenarios and input checks
Contribution-adjustment discussion
Present the current-contribution ledger alongside balances achievable with the calculated minimum to explain which scheduled payment drives the gap.
Use this as preparation for reducing sudden additional funding demands, while reviewing repair-plan adjustments, management rules and resolutions separately.
Quotes and staged payments
Split a staged construction contract into its actual payment months and verify that separately entered design, supervision or tax items have not already been included in the quote total.
If a work quote or method lifetime comparison is needed, use the related tool to prepare that amount and bring only the resulting scheduled total into this ledger.
Recheck growth, receipts and horizon
A first-month-price quote of KRW 1,000,000 paid 12 months later at 10% annual growth becomes KRW 1,100,000 in this model.
Growth is a user assumption, not an official forecast; replace assumptions when new written prices become available.
Confirm the net amount and date of every interest or funding receipt and check that major payments have not slipped beyond the analysis period.
Frequently asked questions
Can we raise billed reserve charges to the calculated minimum immediately?
The minimum is a liquidity budget for the entered work and cash-flow schedule.
Actual billing requires checking the complex’s management rules, repair-plan allocation, adjustment procedures and relevant resolutions.
Why is there a shortfall when the final balance is positive?
An earlier payment may require funds before they arrive, including deposits received later in that same month.
Later recovery does not fund the earlier deadline, so review the first shortfall month and the lowest payment-time balance together.
Why can a higher monthly contribution fail to cover a first-month advance payment?
Work paid before the first month’s deposits cannot use contributions that have not yet arrived.
The calculator separates immediate funds needed before starting from minimum monthly deposits after those funds have been secured.
Should I enter zero when a reserve amount is unknown?
Zero means an amount has been verified as zero, whereas a blank means it is unknown.
Results are withheld if opening funds, monthly deposits, or any entered work or receipt amount is missing; reconcile the bank balance and ledger first.
Can I use an 84 m² exclusive unit area?
The area share uses housing supply area, which differs from exclusive area and the building’s gross floor area.
Use matching total and unit supply areas from management; equal allocation is an illustrative comparison only.
How should verified interest and other funding be entered?
Enter verified net interest and non-borrowed funding once in the month when the funds arrive.
Do not duplicate money already included in the opening balance or monthly deposits, and exclude loans and uncertain grants from this model.
Does a smaller gap after delaying work mean that we saved money?
A delay can move an expense outside the analysis horizon, removing it from this period’s totals.
Check excluded items and their new payment months, extend the horizon where appropriate, and separately confirm safety, approvals and contractual deadlines.
Does this tool determine elevator, roof or pipe repair cycles and quotes?
It takes verified work dates and total payments as inputs rather than creating repair cycles or market prices.
Review Annex 1 of the Enforcement Rule, equipment condition, work scope and written quotes with management and qualified specialists.
Official sources, effective dates and future rechecks
Current status and article text were verified through the Korean National Law Information OPEN API on October 8, 2026 (2026-10-08).
Act MST 284009 and Decree MST 287261 are effective July 1, 2026; Enforcement Rule MST 288369 and Annex ID 18339091 use the July 30, 2026 amendment and effective version.
After a legal amendment, recheck current articles and annexes and whether a separate minimum-reserve notice applies.
Update inputs whenever the approved plan, management rules, available reserve, quotes or actual payment and receipt dates change.
This model does not automatically assess investment returns, loan repayments, repair life or safety, management-rule violations, or separate special-repair reserve systems.
Identify funding needs before the planned works come due
Prepare bank funds, the approved repair plan and written work quotes on a consistent basis, then review the first shortfall and minimum monthly deposits together.
Keep the saved review with the owners’ council documents so the inputs and assumptions behind the result remain traceable.
Return to the funding gap calculator