Korean Year-End Tax (연말정산)
Cash Receipt Checklist: Prep Before the January Deadline

The Year-End Tax Settlement (연말정산) Timeline: Three Windows You Cannot Miss

Korea's year-end tax settlement follows a fixed annual calendar set by the NTS (국세청, National Tax Service). Missing any of these windows means waiting until the following year's May comprehensive income tax filing — or filing a corrected return (경정청구) later — to claim the deduction you could have gotten in February. The three critical windows are:

Window 1 — Early December to January 15: Employer Registration and Consent. Your employer must register the list of employees eligible for year-end settlement (연말정산 대상자 명단) with Hometax by November 30. Then, from December 1 through January 15, each employee must consent to the simplified data bulk-provided service (간소화자료 일괄제공서비스) — a single consent that, once granted, lasts until you leave the company. Without this consent, your employer cannot download your tax data on your behalf, and you must handle everything manually through the main Hometax portal.[NTS Year-End Guide via Brunch]

Window 2 — January 15 to 20: Hometax Simplification Service Opens. The 연말정산간소화서비스 (year-end settlement simplification service) opens on January 15 each year. This is the date your NTS-verified data — including all electronic 현금영수증 transactions linked to your registered phone number — becomes available for download. The initial January 15 release reflects what the NTS has received from merchants as of that date. A final confirmed set, incorporating corrections and late-submitted data from issuing institutions, becomes available on January 20.[Chosun Ilbo, Jan 14 2026]

Window 3 — January 15 to mid-February: Document Submission to Employer. Most companies require employees to submit their year-end settlement documents — the Hometax PDF download plus any supplementary receipts — between mid-January and mid-February. Some employers using the bulk-provided service download the data automatically and only request additional documentation for items the NTS did not collect (private academy fees, certain rental expenses, specific donation receipts). The final employer deadline for submitting the year-end withholding statement (지급명세서) to the NTS is March 10, but your window as an employee closes much earlier — typically late January.

For more context on why the timeline itself creates pressure, see our analysis of why manual cash receipt matching costs more than Korean employees realize.

Before January 15: Register Your Phone Number in Hometax

This single step is the most common reason Korean employees see zero won (현금영수증 0원) when they open their simplification service data in January — and it takes under two minutes to fix, provided you do it before the deadline.

A 현금영수증 is only linked to you in the NTS database if the phone number you gave the cashier has been pre-registered as your cash receipt issuance method (현금영수증 발급수단). Handing your number at the register does not automatically register it — it's a separate step, and one that most employees either don't know about or assume happens automatically. The NTS's own guidance^[NTS] is clear: without prior registration, the receipt data sits in the NTS database as an orphan record — the NTS has the transaction, but it cannot identify whose deduction it should be.

Here is the exact path to register (or verify) your number:

If your number was already registered, do not assume everything is fine. Verify that the currently registered number is the one you use at checkout — especially if you changed carriers or devices in the past year. Phone number changes are the most common reason for mid-year orphans even when registration was done correctly.

Mid-January: Download and Verify Your Hometax Cash Receipt Data

Once the simplification service opens on January 15, the first thing to do is not to rush everything to your employer. The first thing is to check whether the data matches what you actually spent.

The NTS aggregates 현금영수증 data from three sources: VAN providers (KICC, KG Inicis, NICE) that process in-store POS transactions, platform payment processors (Naver Pay, Kakao Pay, Toss) that transmit digital transaction data, and self-issuance records (자진발급분) that merchants submitted using the NTS code 010-000-1234. Each source has its own latency and completeness characteristics. A transaction at a convenience store registered on a VAN network appears within 24 hours. A self-issued receipt from a small merchant who submitted it on paper may take days or weeks to appear — or may not appear at all unless the consumer registers it manually.

Here is what to check in the Hometax download:

For a complete walkthrough of how to structure a single year's worth of cash receipt data — including column recommendations for your own tracking spreadsheet — see our guide on extracting Korean cash receipt data to Excel for tax deduction.

The Deduction Rules: What Your Cash Receipts Are Actually Worth

To evaluate whether the effort of tracking down missing receipts is worth it, you need to know what each receipt is worth in tax terms. The math is straightforward once you understand the three-layer structure.

Layer 1 — The threshold. Under the Income Tax Act (소득세법) Article 126-2, your combined spending on credit cards, check cards, and cash receipts only qualifies for income deduction once it exceeds 25% of your total annual salary (총급여). For an employee earning 50 million won per year, the first 12.5 million won of spending generates zero deduction — regardless of payment method. The deduction formula only applies to spending above this threshold.^[NTS]

Layer 2 — The deduction rates. Above the threshold, the rate varies by payment method:

Cash receipts and check cards earn double the deduction rate of credit cards. The NTS applies the credit card spending first to the 25% threshold — this ordering rule means that once you pass the threshold, every additional won paid via cash or check card is effectively worth twice as much as a credit card won in deduction value.

Layer 3 — The limits. There are caps on how much deduction you can claim in total:

An employee earning 50 million won who spends 20 million won across all payment methods, with 4 million won of that in cash receipts, would calculate the deduction as follows: the first 12.5 million won (25% of salary) yields zero deduction. The remaining 7.5 million won is eligible for deduction, applied in the NTS's order (credit card first, then cash receipts). If 3 million of the remaining was on credit card and 4.5 million was on cash receipts, the deduction is roughly 3M × 15% + 4.5M × 30% = 450,000 + 1,350,000 = 1,800,000 won in income deduction. At a marginal tax rate of 15% this reduces tax by about 270,000 won — not a life-changing number, but real money for a 15-minute check.

For a practical example of what happens when 150 receipts are processed end-to-end through batch extraction, read our guide on batch-processing a year of Korean cash receipts into a tax deduction summary.

When Receipts Are Missing: A Recovery Plan

Even with a registered phone number and diligent data checking, some 현금영수증 will inevitably be missing from your Hometax download. The recovery options depend on why they are missing and how far back the transaction dates.

Scenario 1: Self-issued receipts (자진발급분). If you paid cash but did not provide a phone number — or the merchant used the NTS code 010-000-1234 — the transaction exists in the NTS database but is not linked to any consumer. You can recover these by going to Hometax → 계산서·영수증·카드 → 현금영수증 → 자진발급분 소비자 등록, and entering the approval number, transaction date, and amount from your paper receipt. This registration can be done retroactively for transactions up to five years old.^[NTS]

Scenario 2: Phone number not registered at the time of transaction. Register your current number now (following the steps in section 2 above). The NTS retroactively links up to 36 months of receipts associated with that number. This fix takes effect within 24 hours, after which you can re-download your simplification service data.

Scenario 3: Old phone number still registered. If you changed numbers during the year but the old number was never removed from your Hometax profile, new transactions are still being associated with the old number. The fix: log into Hometax, delete the old number, register the new one, and wait 24 hours. The receipts from after your number change will then link to your new identity. The old-number receipts remain linked to the old number — but since that number was registered under your name originally, you can still claim them by re-downloading from the January 20 final confirmed data or by filing a corrected return (경정청구) within five years.

Scenario 4: Merchant never issued a receipt. For 현금영수증 의무발행업종 (mandatory-issuance industries — hospitals, academies, real estate agents), the merchant is legally required to issue a receipt for any cash transaction over 100,000 won. If they did not, you can report them to the NTS through the "미발급신고" (non-issuance report) system and receive a reward of 20% of the unreported amount. For non-obligatory merchants, you can request the merchant to issue a supplementary receipt retroactively.

When Physical Receipts Don't Match Hometax

The scenarios above cover the cases where the NTS does have the data but cannot connect it to you. A harder problem is the reverse: you have a physical 현금영수증 slip — from a traditional market stall, a taxi ride, a small hardware store — that was never transmitted to the NTS at all. These exist entirely outside the digital pipeline, and your Hometax dashboard will never show them unless you manually enter the transaction data.

This is where the real bottleneck of 연말정산 cash receipt preparation lives. Korea's electronic cash receipt system is remarkably comprehensive — roughly 95% of transactions follow the digital path — but the remaining 5%, multiplied across the tens of millions of 현금영수증 issued annually, represents a significant volume of manually managed data. And these are often the transactions that employees most need to track, because they occur at the small merchants where credit cards are less likely to be accepted.

The manual workflow for a paper slip goes like this: find the slip (often from a stack accumulated over months), read the date, vendor, supply amount, VAT, and approval number, type each into Hometax or a spreadsheet, categorize the expense type mentally, and repeat for every slip. At 2 to 3 minutes per slip, 20 paper receipts cost an hour of January time — time that could be spent checking deduction limits or verifying data completeness instead.

For employees who receive paper 현금영수증 slips regularly, the practical workaround is to digitize the slips as they are collected — not in January. Taking a photo of each paper slip with your phone and using an AI data extraction tool to read the fields (date, vendor, amount, approval number) converts the physical receipt into structured data in seconds. The output is a spreadsheet row that you can batch-compare against your Hometax download in January. If a slip does not appear in Hometax, you have the approval number ready for manual registration. If it does appear, you just saved yourself the typing.

The tool that enables this workflow — Custom Column Extraction — works differently from traditional OCR. Instead of requiring you to draw a box around each field or define a template for each receipt format, you simply name the columns you want extracted: "Transaction Date", "Vendor Name", "Supply Amount", "Approval Number". The AI reads each receipt photo and locates the values by understanding what each piece of text means — not by where it sits on the slip. A thermal receipt from a taxi, a hand-written slip from a market vendor, and a printed receipt from a pharmacy can all be processed in the same batch without separate setup per format. This capability is called format-independent extraction, and it is the practical difference between digitizing five paper receipts in a minute versus spending five minutes on each one.

The One-Click Alternative: Process All Receipts in One Batch

The checklist above assumes you are working within the NTS system — registering numbers, verifying data, manually recovering missing receipts. But there is a complementary approach that bypasses several of these steps entirely for the employees who face the most fragmented receipt situation: those who regularly receive paper slips from small merchants, pay through multiple platforms, and need to reconcile everything against Hometax.

Instead of logging into Hometax, checking data source by source, and manually entering paper slips one at a time, you can collect all your receipt images — phone photos, screenshots, scanned paper slips, PDF exports from payment apps — and upload them to an AI extraction tool in a single batch. Define the columns you need, let the AI read every receipt, and export a consolidated spreadsheet. Then compare that spreadsheet against your Hometax download in a single pass to identify which receipts are missing from the official system and need manual registration.

This batch-first approach collapses the multi-hour January data check into a 15-minute process. The same AI that reads your paper slips also categorizes each one by expense type — 식대 (meals), 교통비 (transport), 의료비 (medical), 사무용품비 (office supplies) — using inferred columns, where you define a column like "Expense Category" with options and the AI assigns the correct category based on the vendor name and transaction context, not on any additional data entry from you.

You can test this workflow now with your own receipts — no registration required — using the demo below:

The spreadsheet that comes out gives you a structured foundation for your year-end tax settlement. You can sort by category, sum by deduction type, and — most importantly — compare line by line against your Hometax download. Any row that exists in your spreadsheet but not in Hometax is a receipt you need to register manually. Any row that exists in both confirms the system is working. The verification process that used to take an evening of cross-referencing becomes a 10-minute column comparison.

For businesses or accountants who manage multiple employees' 현금영수증 data, the Collection Link feature allows each employee to upload their paper receipt photos to a shared processing queue without needing their own account — useful for HR teams or tax accountants collecting receipts from multiple staff members before the filing deadline.

Frequently Asked Questions About Year-End Tax Settlement (연말정산) Cash Receipt Preparation

Bottom Line: The 15-Minute Checklist Is Worth More Than Any Deduction Rate

The difference between an employee who maximizes their 현금영수증 deduction and one who loses 100,000 to 300,000 won in potential savings is not knowledge of tax law. The deduction rates and limits are published everywhere. The difference is knowing where the system breaks and checking those specific break points before the deadline.

Three checks, 15 minutes total, can recover receipts worth real money: (1) verify your phone number is registered in Hometax and that no old number is still active; (2) download and spot-check your simplification service data against your own estimates; (3) collect any paper slips you have and either register them via Hometax or digitize them with an extraction tool while you can still act. Do these three things before the January 15–20 window closes, and your tax settlement moves from "I hope I got everything" to "I know exactly what my deduction is."

The January scramble is optional. The receipts are trackable. The only thing missing is the five minutes it takes to check your phone number setting right now.