@fannypack From my understanding and findings of the math, it’s 1000. So if you’re born on or after April 2nd 1946 then your multiplier is 1000 (one thousand).
Then for EPI months contributed March 2003 or earlier the calculation is 7.125 divided by multiplier (which is 1000) so:
ASR x (7.125/1000) x (Number if your EPI months March 2003 and earlier)
And for EPI months contributed April 2003 and later the calculation is 5.481 divided by multiplier (which is 1000). So:
ASR x (5.481/1000) x (Number of your EPI months April 2003 and later)
So say your ASR is ¥500,000 and you contributed 480 months total (40 years). 240 months were on/before March 2003 you’d do:
¥500,000 x (7.125/1000) x 240 months
= ¥855,000
The other 240 months were on/after April 2003 you’d do:
¥500,000 x (5.481/1000) x 240 months
= ¥657,720
Then ¥855,000 + ¥657,720 = ¥1,512,720
So for someone born on/after April 2nd 1946, with an ASR of ¥500,000 and with 480 months contributed to EPI (240 months of which were on/before March 2003 and 240 of which were on/after April 2003) would be ¥1,512,720
Then EPI premiums include national pension so that also means they contributed 480 months to national pension too. So you can also add 480 months national pension into that which is ¥780,900.
So ¥1,512,720 + ¥780,900 = ¥2,293,620 per year.