BritTim

Nobody is suggesting using two passports at customs. Your new passport with the entry stamp is perfectly sufficient if the customs officials ask to see your passport. The necessity to show both the old and new passports exists when checking in for your flight with the airline, or when passing Immigration on arrival in Thailand. In both cases, it is because there are relevant stickers/stamps (visa or re-entry permit) in the old passport required to enter Thailand.

This is an English language forum. A post in French has been removed.

No problem with an in/out at Chong Mek. Cambodian border crossings have many scams associated with them. They have leverage because of a Cambodian law that, in most cases, mandates that you stay at least one night in Cambodia. With determination, it should be possible to navigate the situation independently, but you must expect to pay bribes for a same day return. I suggest you initially express your intention of going to Pailin. Then, after a meal at the casino, return and tell them you have changed your mind and intend returning to Thailand. See what they say. React accordingly.

Leaving aside the special case of Poipet/Aranyaprathet, the situation at land crossings is fairly clear cut. With a visa, there should be no problem. Entering visa exempt, you can enter twice per calendar year without difficulty, but cannot get more than two. At airports, it varies both depending on which airport you are using and which official you encounter. With visa exemptions, it is possible to be denied entry if using visa exempt entries as a long stay tourist, especially with minimal gaps between visits. Denied entry is much more likely at some airports (including both Bangkok airports) than others. At some (notably Chiang Mai) they seem only to crack down on visa exempt entry in fairly extreme cases, but everywhere it also depends on the individual officials. When you enter with a visa (even at airports) you are only supposed to be denied entry for very specific reasons (specified in Section 12 of the Immigration Act) which do not include staying in Thailand too much. However, some officials at some airports (again, including both Bangkok airports) on rare occasions decide to improperly deny entry to holders of tourist visas anyway, pretending they are using a valid reason under Section 12 (such as you not having money to support your stay).

Entering via most land crossings should be fine (but avoid Poipet/Aranyaprathet). At airports, entering with a visa should not be a problem. However, there have been rare cases of denied entry for those with tourist visas at some airports. Some officials hate long stay tourists, and may look for opportunities to give them problems. Both Bangkok airports and Krabi are to be avoided if you want to be completely safe. Chiang Mai has historically never been reported to improperly deny entry to those with visas.

As the person who is on the rental agreement, she qualifies as the "house master",

I add my advice to get a tourist visa, especially if planning to enter via one of the Bangkok airports.

At most entry points, that will not be a problem. Obviously avoid the rogue land crossing at Poipet/Aranyaprathet. The wrong official at some airports (where they hate long stay tourists anyway) might raise an issue. If nervous, but wanting to mostly use air travel, consider flying to Vientiane and returning via the Friendship Bridge to Nong Khai. You can then fly from Udon Thani to your final destination. If convenient for Chiang Mai airport, that is another option, but be careful that flights you use do not involve clearing immigration in Bangkok.

Officially, copies are not supposed to be accepted as valid id. In practice, you can often get away with it.

I assume you acquired the new passport while in Thailand. You are not obliged to transfer anything from the old to the new passport within any specific period of time. If you make a trip out of Thailand without having had stamp transfer done, the airport officials will do the minimal necessary transfers to allow them to then stamp you out of Thailand using the new passport. This leaves you in a sort of half and half state where some stamps remain in the old passport. You will continue to need both passports for travel while in that state. When you visit your immigration office for any other service (such as a new extension of stay) the official will transfer additional stamps from the old to the new passport. That will include your previous extension and (if originally issued by them) re-entry permit. Visas and, sometimes, re-entry permits are not transferred. If there are unexpired visas or re-entry permits in the old passport that were not transferred to the new passport, you will still need the old passport to travel, but this will not apply to most people.

It is an alternative to them using the computer to photograph you using the computer at the desk inside. It saves you time waiting in the queue to make the application at the desk. it proves your attendance at Immigration.

Siem Reap airport is easily reached from Poipet, but there are no direct flights from there to Vientiane. Connecting flights are often via Bangkok with a change of airport (and potential trouble at Thai immigration). Vietnam Airways does (expensive) direct flights to Vientiane from Phnom Penh. However, Phnom Penh airport is a long way from Poipet.

Locally developed forms can be legit and, unlike the standard forms, will not have such identification numbers. Thai officials love paper, and some senior officials are in heaven when designing their own contribution to paper waste. They can be used for extortion purposes, but more often are just a bright idea of the senior official's.

The decision to be tough on tourist visa applications in Savannakhet was forced on them by the hordes of visa run groups descending on them. Those had to be deterred. For a short while, before the introduction of the appointment system, Vientiane was strict for similar reasons. In general, both the embassy in Vientiane and the consulate in Savannakhet want to be friendly, but they cannot work miracles.

If you have a visa, there is no limit to the number of times you can enter by land. You could enter via a border crossing from Cambodia, but do not use Poipet/Aranyaprathet. If you want to visit a friend in Poipet, getting to other border crossings is a hassle, but doable. Consider leaving Thailand to Poipet (Thai immigration can annoy you, but nothing very bad can happen), then going on from there to Vientiane, getting your visa and returning via the Friendship Bridge to Nong Khai. This plan allows you to wait with your friend until a day or two before your appointment at the Vientiane embassy, and travel overland to Laos for your visa application (a tough journey, but doable).

You will need to go to the local immigration office to get necessary stamps transferred to the new passport. You may or may not need a letter from your embassy requesting the stamp transfer. Many countries have stopped providing these, and Immigration will do the transfer without. If there is no indication in the new passport that it supersedes the old one, a letter may be needed, and this may well be the reason why Immigration at the airport refused to use the new passport on entry. You need to confirm the letter requirement with your embassy and local immigration office. Otherwise, the process is simple.

First of all, the Aranyaprathet/Poipet border crossing is the absolute worst choice for trying to enter Thailand when spending significant time here in Thailand. Having entered Cambodia, to attempt to get a tourist visa, you would need to go to Phnom Penh. There are buses from Poipet to Phnom Penh. The visa application takes several days. If you have no previous Thai tourist visas in your current passport, your chances of being given the visa are reasonably good though, as you have been over 90 days in Thailand recently, you might be denied. If successful in getting the visa, do not try to re-enter at Poipet. This would not be my starting point. If able to get an appointment in Vientiane, that would be your safe option. However, you have left it too late unless willing to wait around for a while in Laos.

https://www.immigration.go.th/?page_id=20131

That is one interpretation. Another is that it forces retirees of those countries to bring post-tax income of 65,000 baht a month into Thailand rather than just show a pre-tax income of this amount averaged over the year, and allowing some of this income to be used in home country. This was a way of increasing the income requirement or forcing people to use money in the bank or agents. The Thai authorities probably do not regard this as a bad thing.

Although this probably does not apply to the OP, if he wanted to use the visa to enter Thailand, he would need both passports. As you are aware, the visa is not transferred to the new passport, and the reference back to it in the new passport is insufficient to use it to enter Thailand.

It will not be enough to stop you being on overstay. Your spouse will still lose their extension as a dependant. However, it improves your chances of avoiding deportation. I cannot advise you because pretty much all I know is that you have no valid passport and have a Non Thai spouse. You probably only have bad options, but a full knowledge of your situation might allow us to suggest the least bad option.

The problem with the suggestion, even if his spouse could meet the requirements for a retirement extension (unlikely without advance planning) is that the OP will find it no easier getting an extension as a dependant without a passport.

That is doable. A side trip by air to somewhere like Saigon or Siem Reap solves the issue of an onward flight out of Thailand within 30 days, and many tourists would find a visit to such places an exciting part of their holiday. It is one of the plausible options.

We do not know the OP's nationality. Without that, we are speculating about what his embassy might be willing to do for him. However, as others have suggested, an absolute minimum ought to be an emergency travel document allowing him to travel to home country. His spouse is a major complicating factor. I do not feel I have enough information to suggest what is likely to be the least unsatisfactory way forward of the various unpalatable options. While a deliberate overstay was sometimes a rational option years ago, it really is a last resort these days. The result could be disastrous.

That depends on your nationality. Look at the website for your country's Thai embassy. In most cases, you will be able to navigate to a page that tells you how to submit a visa application. Often, it is now done using the e-visa system.