Why is a tax invoice from a closed partner a problem?

Once a business closes, its registration number can no longer legitimately issue tax invoices. If you receive an invoice dated after the closure, it may be treated as a 'false tax invoice,' and you may be unable to claim that input VAT deduction. If you've already filed VAT with it, you may need to amend the return and could face under-reporting or late-payment penalties. However, invoices properly issued for supplies made before the closure date are generally fine, so it matters to check both the supply timing and the closure date. Confirm the specifics with a tax professional or the tax authority.

Where do I check whether a partner has closed?

In South Korea, the National Tax Service Hometax business-status lookup shows active, suspended, or closed status by the 10-digit registration number. A business registration number lookup tool lets you check several partners' status at once without logging into Hometax each time, and cross-check whether the representative name and start date match your documents. Checking at two moments—before starting a new trade and before receiving a tax invoice—is the safe habit.

Got a Tax Invoice From a Closed Business Partner? Check Their Status First

May 29, 2026

Run a business long enough and this happens. You order from a company you've dealt with for a while and pay in full—then, only after receiving the tax invoice, you find out that company had already closed. And it doesn't stop there. A tax invoice issued under a closed registration number may block your input VAT deduction, and if you've already filed VAT with it, you could be looking at an amended return plus penalties. It wasn't your mistake, yet the tax burden lands on you.

Here's the bottom line. Most of this loss is preventable with a single check before you trade. With just the registration number, you can look up whether that partner is an active business, suspended, or closed—and whether the representative name and start date match your documents. Let's walk through why a closed-partner invoice is a problem and how to check ahead of time.

Note

Tax invoices, input VAT deductions, and business-status lookups here are based on South Korea's VAT system and the National Tax Service (Hometax). Confirm the exact treatment of any specific case with a tax professional or the tax authority. The 'check before you trade' habit itself applies to partner risk anywhere.

A closed-partner invoice loss is mostly preventable with one status check before you trade.

Why is a closed-partner invoice a problem?

The core idea is simple. When a business closes, its registration number loses the standing to issue tax invoices. Receive an invoice dated after that closure and the tax law may treat it as a 'false tax invoice.' In that case you may be unable to claim the input VAT deduction. If you already filed VAT using it, you may have to amend the return and, depending on the situation, face under-reporting or late-payment penalties.

Note: supplies made 'before the closure date' are generally fine

Not every trade is blocked. An invoice properly issued for a supply actually made before the closure date is generally not a problem. What matters is the relationship between the 'supply timing' and the 'closure date.' So along with whether a partner closed, it matters when they closed. When it's ambiguous, confirm with a tax professional or the tax authority.

Skip the check, and the loss unfolds like this

Words don't land, so here's how the loss spreads, as a picture.

STEP 1

Trade unaware

Closure unchecked

STEP 2

Receive invoice

Closed-business one

STEP 3

No deduction

Input VAT blocked

STEP 4

Penalty risk

Amend + penalties

The 'one check' at STEP 1 can block all of the rest

Before you trade, check the partner's status like this

The check itself is easy. All you need is the 10-digit registration number.

STEP 1

Look up active/suspended/closed status first

Enter the partner's number in the status tab of the business registration number lookup and you get their active / suspended / closed status. It draws on tax-authority data, and you can enter several partner numbers at once. No need to log into Hometax each time, so it's great for a quick sweep before starting a new trade.

STEP 2

Cross-check the representative and start date against your documents

In the same tool's verification tab, along with the number you can cross-check whether the representative name and start date match the actual registration. Confirming that the info on a contract or business card really belongs to that business once more helps you catch a changed ownership or wrong details.

STEP 3

Check again right before the invoice and before the VAT filing

Even after a trade begins, time passes and situations change. So the safe habit is another sweep of the issuer's status right before paying or receiving a tax invoice, and when organizing purchase records before a VAT filing. Screen it out before filing and you keep a closed-business invoice from slipping in.

Cover these two moments and most of it is blocked

Before starting a trade — verify status and identity for new or resumed partners.
Before the VAT filing — sweep the status of your purchase-invoice issuers at once.

It looks tedious, but a few seconds of lookup is far cheaper than the loss one misfired input VAT creates.

Who needs this most

Businesses with churning partners — wholesale, distribution, manufacturing that open new trades often.
Those who order from freelancers and vendors — small operators close and re-register frequently.
Small owners who handle their own VAT — especially useful for verifying purchase records before filing.
Accounting and bookkeeping staff — look up many partners at once for routine checks.

Three easy mistakes to avoid

"We've dealt with them forever, it's fine" is the riskiest

A closure loss tends to hit not with new partners but when you let your guard down with a long-standing one. If they don't tell you they've closed, there's no way to know. Even with a familiar partner, checking status before paying or receiving an invoice is the safe move.

A lookup is 'reference'; the final call is with a tax professional

A status lookup is a reference to screen risk ahead of time. If you've already received a closed-business invoice or the handling is unclear, decide concrete steps—amended tax invoice, amended return—with a tax professional or the tax authority. This article is general practical guidance.

One wrong digit changes the result

A registration number is 10 digits, so a single wrong digit returns a different business. When copying from a contract or card, recheck the digit count and hyphen position, and always confirm the result's business name and representative match the actual partner.

In short — one check is cheaper than a penalty

What's scary about the closed-partner invoice loss is that it isn't your mistake, yet the burden lands on you. But most of it is preventable with one habit—using the business registration number lookup to check active/closed status and the representative and start date before you trade. Cover two moments: before starting a new trade, and before the VAT filing. It's free, no install, just enter the number in your browser.

If you're curious about how closed-business tax invoices are treated, see South Korea's National Tax Service Hometax tax invoice FAQ. For any specific case, consult a tax professional.

Before you're left saying "I should've checked," look up the partner's status first.

Frequently asked questions

: Once a business closes, its registration number can no longer legitimately issue tax invoices. If you receive an invoice dated after the closure, it may be treated as a 'false tax invoice,' and you may be unable to claim that input VAT deduction. If you've already filed VAT with it, you may need to amend the return and could face under-reporting or late-payment penalties. However, invoices properly issued for supplies made before the closure date are generally fine, so it matters to check both the supply timing and the closure date. Confirm the specifics with a tax professional or the tax authority.
: In South Korea, the National Tax Service Hometax business-status lookup shows active, suspended, or closed status by the 10-digit registration number. A business registration number lookup tool lets you check several partners' status at once without logging into Hometax each time, and cross-check whether the representative name and start date match your documents. Checking at two moments—before starting a new trade and before receiving a tax invoice—is the safe habit.
: You don't have to look up every trade, but some moments carry more risk: a brand-new partner, a partner you're resuming after a long gap, the point right before paying or receiving a tax invoice, and when organizing purchase records before a VAT filing. Especially before filing, a quick sweep of your purchase invoice issuers can screen out any closed-business invoices mixed in.

Related tools

business registration number lookup

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