Can the DTV visa holder stay in Thailand for more than 180 days per year?

DTV visa has no maximum number of days in a year, maybe you confuse it with the fact that when you stay 180 days or more in a calendar year, you become automatically Thai tax resident.

Practical consequences of that heavily depend on your personal situation.

How much trouble have folks had becoming tax residents on the DTV, I.e. getting a TIN, certificate and filing taxes? With major issues opening a bank account on a glorified tourist visa, there's likely issues on the willingness to hand out residency proof such as tax certificates and TINs

No this is not correct. There is no limit to the number of days you can stay in Thailand per year. There are multiple topics to consider.

1) length of visa - 5 year validity

2) entry stamp - this tells you how long you can stay each time you enter. 180 days each time.

3) there is no rule regarding how many days you can stay per year. Nor is there a rule regarding how many times you can leave or enter.

4) there is a separate and distinct responsibility to report your location to immigration at 90 days. This is completely separate than the visa, length of stay, etc

The DTV allows for up to 180 days per entry. You can leave and come back and get another 180 day entry stamp each time.

With this, unser the current rules, you can stay basically in Thailand for 5 years with short trips out of the country occasionally to get a new entry stamp

with border runs you can literally stay for 5 years

How did you get a visa in the first place if you can’t work out what the rules are

If you stay more than 180 days in a calendar year, you will be object for taxing

No, you can enter, exit and reenter freely. You definitely can stay almost the whole year if you want. I started 2025 in Thailand, and here I am still.

Incorrect on all statements.

What I've done a few times now,

Enter thailand, report 90 days at immigration, leave thailand at 179 days, to avoid a second 90 day report,

Reenter thailand, report at 90 days,

You don’t extend at 90 days , you do immigration reporting every 90 days just like all people stay over 90 days. Can extend for another 180 days. After which you can leave and reenter for another 180 days. Most people just leave and reenter after 180 days .

Alternatively, come and go as you please and receive 180 days each entry

You can stay more than 180 days in a year as many do. You can stay a max of 180 days without extending. You extend via an IO or a border hop which is the most popular way

Each entry gives you a stamp for 180 days. If you stay for 90 consecutive days you must do a 90 day report at immigration.

There is no limit on how many times you can exit and re-enter during the 5 year validity of that visa.

You can extend for another 6 months to stay in Thailand for a year then you have to leave an come back