I am applying for a single-entry visa from NYC. I am in my late twenties and will be quitting my job.  I intend to stay for 60 days and then extend my visa another 30 days. One of the requirements on the Thai Consulate website is this:

 

1.        Letter certifying current employment OR a guarantor’s letter from a U.S. resident/affiliated organization

 

I plan to ask my mother to be my guarantor. Does anyone know specifically what this letter should say, or have a sample by any chance? Thanks in advance.

I think you need to go back and read the page again. That is not needed if you are a US citizen or a legal resident. That is shown here.

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ADDITIONAL REQUIREMENTS FOR AN APPLICANT WHO IS:

          - A HOLDER OF TRAVEL DOCUMENTS OF YOUR RESPECTIVE COUNTRY

          - A HOLDER OF RE-ENTRY PERMIT

          - A HOLDER OF PASSPORT from Afghanistan, Algeria, Bangladesh, Cambodia,

Cuba, Egypt, India,Iran, Iraq, North Korea, Lebanon, Libya, Nepal, Nigeria,

Pakistan, Palestine, Saudi Arabia, Sri Lanka, Sudan, Syria, Vietnam, Yemen,

 

 

 

Source after getting to the tourist visa page here: http://thaiconsulnewyork.com/english/index.php

This is all that is required for your application.

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TOURIST VISA (TR) : TOURISM, VISITS TO FRIENDS AND RELETIVES

         1. Original and Copy of passport valid for at least six months

         2. Copy of valid US permanent resident card or visa.  To obtain multiple entry tourist visa, a certify letter from employer OR a letter from educational institution certifying a full-time student status is required. 

         3. Confirmed air ticket and accommodation in Thailand

         4. Applicant’s recent bank statement reflecting sufficient funds for the period of stay in Thailand (at least US$750/person, or US$1,500/family).  To obtain multiple entry tourist visa, bank statement must have at least US$7,000.

Source: https://www.thaicgny.com/ภาษาอ-งกฤษ-english-version/visa-service/doc-tourist-visa/

I see. That makes a lot of sense. Thank you!