If you transition from a Reserve Component to Active Duty, how do you figure out how many retirement points you have?

The simplest answer is to take your point count, subtract the membership points (15 a year) as they are not counted, and divide the number remaining by 30 and that is your number of creditable months.
After that, it is a matter of remaining AC long enough to attain 20 years.
The big step in this process when you transition is calculating your Retirement Year Ending date, or RYE date. Done incorrectly, it can cause you a lot of pain and suffering later on when you are trying to retire.

Only your active duty time counts towards your active federal service. The battle assembly weekends and membership points will get added in, but only after you qualify for a 20 year regular retirement. Thoses points are added up and divided by 30 and credited in whole months towards your retirement pay.

Found this info on a National Guard website, Hope this helps

"1405" Service and Retirement
What is "1405" Service?

1405 Service is actually those Inactive Duty Training (IDT) points creditable toward retired pay that a reservist earned (normally prior to being ordered to continuous active duty service).

Does 1405 Service count when I compute my 20 year active duty service and retirement eligibility date?

No. To qualify for active duty retired pay, you first MUST complete 20 years of active duty – or qualify for, apply for, and be accepted for Temporary Early Retirement Authority (TERA) before you can count 1405 service. Note: TERA is normally offered to individuals in controlled grades who have more that 15 years, but less than 20 years of active duty service

How does 1405 Service affect my active duty retired pay?

To calculate your 1405 service, you will need to know two numbers – your total points for retired pay and your total active duty points. You can get these numbers from the printout you receive annually – Air Guard from your AF Form 526 or Army Guard from your RPAM (NGB Form 23B).

Sample calculation:

Total Points for Retired Pay 7458

minus AD Points - 6773

equals 1405 Service Points 685

You’ll need to convert 1405 points into years
685 divided by 360 = 01 yrs 10 mos 25 dys

In this case active duty retired pay will be calculated on total years of active duty plus 1405 service.

Active Duty 20 yrs 00 mos 11 dys

plus 1405 service 01 yrs 10 mos 25 dys

equals 21 yrs 11 mos 06 dys

CPT (Join to see) You should have a Chronological Retirement Points Statement in your personnel record. Depending on when you transferred, it will either be an AHRC 249-E or a DA 5016 if transferring from Army Reserve or an NGB 23B from the state if you were in the National Guard. If you don't have a copy of this document you can look in your electronic record through the HRC website or contact the state guard headquarters if you transferred from the National
Guard.

I started transitioning this week after spending 28 years in USAR then 12 RA. 1. Get a Chronological Statement of Retirement Points (DA 5016) and make sure it is correct. I had missing time for a deployment and miscalculated time from another, and some ADT missing. 2. The 5016 will have a total of Active Duty Points. Divide it by 360 and convert to years,months, days. Then add that to your RA time. This will be your qualifying time for AC retirement (Minimum 240 months). 3. Retirement pay will include all other points on your 5016 but there are maximum limits (130pts /year since 30 Oct 2007, 90 pts since 30 Oct 2000. Add those points and divide by 360 - convert to year month days and add to qualifying retirement time. This will be your time for retirement pay. When you come on RA status you should get a service computation - make sure it is correct and your BAS is correct. Mine was not and caused me to delay retirement by 2.5 years. Remember your retirement pay may be increased by 2.5% for each year over 20.

You also wanna keep calculating points to see if your reserve retirement might pay better than active. With the new rules/ regulations allowing earlier retirement as low as age 50 from the reserves look at both as you do an annual assessment. I worked with an AGR CSM that had enough for an active duty retirement but chose to serve AGR until he was like 58 go back TPU and when he turned 60 he was gonna make more monthly for the remainder of his life under the reserve plan instead of AC plan.

1LT Eric Rosa just keep counting 365 366 leap year for active duty points until you qualify for an active duty retirement after 20 years. Once back on active duty Finance will be able to adjust your years for active duty credit. With no guarantee you'll reach 20 years active duty until you reach 18 years to sanctuary.

One point for every day of Active Duty you have. Do not count DEP time!!

You should get credit for every day you spent on AD while in the reserves however that does not include AT IDT drills etc. There is a service computation that should be completed upon your return to AD and your [BASD] will be adjusted. All of the other points may be part of your retirement pay calculation.

You should have received a point record from the Reserves, they are issued each year. keep them and they are sent out each year as a record of credit points and ID if You had a good or Bad year credible towards retirement or not.