Last Updated on October 3, 2026 by Jeff Tomas
An overstay can cost THB 500 per day, up to THB 20,000, and a long overstay can also bring an entry ban or other immigration action. If your permitted stay has expired, check your dates and contact Thai Immigration about what to do next.
This calculator provides a planning estimate, not an official decision or legal advice. The overstay count starts the day after your permitted stay ends, but confirm how your departure date will be counted with immigration. For the fine rules and possible consequences, see Thailand overstay fines and re-entry bans.
Key Takeaways
- Estimate the fine at THB 500 per chargeable day, capped at THB 20,000 after 40 days. Check the Thai Embassy’s overstay guidance for the published fine rules.
- Count overstay from the day after your permitted stay ends, then verify your dates and departure plans with Thai Immigration.
- A fine estimate doesn’t show every consequence. Voluntary surrender and arrest can lead to different re-entry bans, as explained in Thailand’s overstay rules and penalties.
- For voluntary surrender, published ban tiers begin after 90 days; arrest can bring a five-year ban for an overstay of up to one year.
- Treat the calculator as a planning estimate, not an official ruling.
Thai Visa Overstay Calculator and Fine Rates: Estimate What You May Owe
You can estimate the standard overstay fine with a simple calculation: multiply chargeable days by THB 500, then apply the THB 20,000 cap. The estimate depends on the correct end date and day count, so check your immigration record before doing the math. The information available does not establish an official Thai Immigration overstay calculator; Immigration determines the amount due.
Find the last day of your authorized stay
Check your passport’s permission-to-stay stamp, often marked “Admitted Until,” or the official record for an approved extension. That date controls how long you may remain in Thailand. A visa’s issue date or expiration date can mean something different: visa validity usually concerns when you may use the visa to enter, while the entry stamp sets your authorized stay after arrival.
For example, your visa may remain valid for entry even though the stay granted on an earlier visit has ended. Use the latest permission-to-stay date recorded by Immigration, including any approved extension, rather than relying on the visa sticker alone. See Thailand’s permission-to-stay stamp guidance for help distinguishing the dates.
Count overstay days and apply the THB 20,000 cap
The reported counting method starts on the day after your authorized stay ends and includes the date you present at Immigration or are apprehended. If permission ends June 1 and you report to Immigration on June 4, the count is three days: June 2, 3, and 4. At THB 500 per day, the estimated fine is THB 1,500.
To work out another estimate, count the chargeable days, multiply by 500, and compare the result with the cap. At 40 days, the daily calculation reaches THB 20,000. For 40 or more days, the standard departure fine remains capped at THB 20,000, rather than increasing with each additional day. The Royal Thai Embassy’s overstay guidance confirms the daily rate and maximum.
Treat the result as a planning estimate, not a final bill. If your entry stamp, extension record, departure date, or day count is unclear, ask Thai Immigration to confirm the dates before relying on the calculation. A fine estimate also does not account for other possible immigration consequences.
What the Standard Overstay Fine Covers, and What It Does Not
Thailand’s standard overstay fine is THB 500 per day, capped at THB 20,000. That amount covers the fine itself when an overstayer reports at a departure checkpoint; it doesn’t settle every possible consequence of overstaying. The Thai Immigration Division 3 notice on overstay penalties also distinguishes the fine from other immigration risks.
How payment at the airport usually works
In the reported airport process, Immigration identifies the overstay and directs the traveler to a payment officer. The officer confirms the amount due, collects payment, issues a receipt, and records the case. Procedures can differ by airport or circumstance, so treat this as a general description, not a guarantee of identical handling.
Keep the receipt with your passport and any related immigration paperwork. Those records can help clarify what you paid and how your case was handled if questions arise later. If your dates or status are unclear, ask Thai Immigration to confirm the amount and next steps before you travel.
Why the fine cap does not erase other risks
The THB 20,000 cap applies to the standard fine, not to every consequence of a long overstay. Immigration’s published rules distinguish voluntary surrender from being arrested and prosecuted. Depending on the circumstances and overstay length, a person may face a re-entry ban or other action, even when the fine has reached its cap. The case of a British man arrested after a 25-year overstay illustrates why the ordinary departure fine shouldn’t be treated as the only risk.
Secondary sources also describe exemptions for minors inconsistently. Don’t assume everyone under 18 is exempt from the fine or other consequences. Confirm the rules for the specific traveler with Thai Immigration before relying on an exemption.
The daily rate and cap are published by Thai government sources. However, detailed explanations of how departure dates are counted often come from secondary guidance, so verify your dates directly with Immigration if the calculation is uncertain.
Long Overstays Can Lead to Entry Bans or Detention
The consequences of a Thai visa overstay depend on how long you remain and whether you leave voluntarily or Immigration apprehends you inside Thailand. A departure fine estimate cannot tell you whether you may face an entry ban, detention, or deportation.
Reported ban periods after voluntary departure
If you report your overstay and leave Thailand, government guidance treats an overstay of more than 90 days as a serious offense and confirms a one-year re-entry ban. Longer ban periods are reported in secondary sources, which commonly list this schedule:
- More than 90 days to one year: one-year ban.
- More than one year to three years: three-year ban.
- More than three years to five years: five-year ban.
- More than five years: ten-year ban.
These thresholds come from secondary explanations, such as this reported Thailand overstay penalty schedule, and should not be treated as a guarantee of how officials will classify every case. The exact boundary wording can vary, especially around the one-, three-, and five-year marks. Confirm your circumstances with Thai Immigration before making plans.
What may happen if Immigration apprehends you
Being caught inside Thailand is different from presenting yourself at departure. Secondary sources report a five-year ban for apprehended overstays of up to one year and a ten-year ban for longer overstays. They also describe possible detention and deportation while authorities process a case. For a real-world example of an arrest after an overstay, see this report about an American arrested in Chiang Mai.
The standard departure fine, even when it reaches THB 20,000, does not predict the outcome of an enforcement case. A calculator can estimate the fine, but it cannot account for an arrest, detention, deportation, or re-entry restrictions. If you have already overstayed, contact Thai Immigration or a qualified Thai immigration lawyer to confirm the current rules and get advice based on your situation.
What to Do If You Discover You Have Overstayed
Act promptly once you realize your permitted stay has expired. A calculator can help estimate the standard fine, but it cannot confirm your immigration record or determine how officials will handle your case.
Check your records and contact the right authority
Start with the passport that contains your latest Thai entry and permission-to-stay stamp. Then check any extension approval or other immigration documents for a newer authorized-stay date. Don’t rely on the visa’s expiration date alone, since it may not match the last day you were permitted to remain in Thailand.
Once you have the relevant dates, estimate the overstay fine using the published rate of THB 500 per chargeable day, up to THB 20,000. Treat that figure as a planning estimate, not a confirmed amount due. If a stamp is hard to read, documents conflict, or you’re unsure which date applies, contact Thai Immigration or the Thai embassy or consulate relevant to your situation. Ask what steps to take before traveling or visiting an office.
An expired stay isn’t automatically fixed by applying for an extension afterward. If you’re considering an extension, ask Immigration whether you’re eligible and what to do next; see this guidance on Thai visa extensions and expired stays.
For a short overstay and a planned departure, confirm the process with the departure airport’s immigration checkpoint before you go. However, if you’ve overstayed for a long period, fear arrest, or have complicated entry and extension records, get qualified Thai immigration legal advice promptly. The distinction between surrendering voluntarily and being apprehended can affect the consequences. The UK government’s Thailand overstay and deportation guidance outlines risks that may include arrest, detention, deportation, and an entry ban.
Prepare for departure and keep proof of payment
If you’re leaving Thailand, allow extra time at the airport in case immigration needs to review your dates or process payment. Bring your passport, relevant stay and extension records, and your departure details. Keep enough funds available for the fine Immigration assesses; your estimate may differ from the final amount.
After payment, keep the official receipt with your passport and travel records. It documents the payment, but it doesn’t erase the overstay or guarantee future entry to Thailand. If you believe the amount or dates are wrong, explain the discrepancy calmly and show your records. Refusing payment or disputing the assessment may lead to further investigation or immigration action, so don’t assume there’s a routine appeal process that will resolve the issue at the airport.
Frequently Asked Questions
These answers cover common uncertainties a fine estimate can’t settle. Your passport stamps and Immigration’s instructions should guide any decision about payment or travel.
Is there an official Thai visa overstay calculator?
The available information doesn’t establish an official Thai government overstay calculator. A hand estimate can help you plan for the standard fine, but Thai Immigration determines the relevant dates and final amount. If your records are unclear, confirm them with Immigration before relying on a calculation.
Does the overstay fine keep rising after 40 days?
No. At THB 500 per day, the standard fine reaches its THB 20,000 cap at 40 days. The cap limits the fine, not other possible consequences of a long overstay, such as an entry ban or enforcement action. The Royal Thai Embassy in Canberra’s overstay regulations state the daily rate and maximum.
Does a visa expiration date always mark the last day I can stay?
No. A visa’s validity date and the end of your authorized stay can be different. Check the permission-to-stay stamp in your passport or your latest extension record, and ask Thai Immigration to confirm the date if it isn’t clear. The Thai Embassy’s stay-permit FAQ also distinguishes the permitted stay from the visa’s validity.
Can I pay the overstay fine before I get to the airport?
Don’t assume you can pay in advance in every case. Reported airport procedures direct travelers to pay after Immigration identifies the overstay at the departure checkpoint. Because procedures may vary, contact Thai Immigration about the specific airport or departure point you’re using.
Will paying the fine guarantee I can return to Thailand?
No. Paying a departure fine doesn’t necessarily remove an entry ban or guarantee admission on a future trip. Ban rules can depend on how long you overstayed and whether you left voluntarily or Immigration apprehended you. A past overstay may also lead to closer scrutiny at the border; see how an overstay can affect entry to Thailand.
Are children exempt from Thailand’s overstay rules?
Don’t assume a child is exempt because they’re under 18. Secondary sources give conflicting age thresholds for fine exemptions, and the government information cited here doesn’t establish a broad exemption for all minors. Confirm the child’s specific circumstances directly with Thai Immigration before making travel plans.
