TG, If I understand your question you may be able to find your answer at the County property tax website here https://taxpayments.co.riverside.ca.us/Search.aspx . (Note – It appears as though it is unavailable until August 1 because of end of year processing). Armed with the assessment number included in the listing you can retrieve a breakdown of the current taxes. I believe that the only amount that recalculates is the 1% general obligation which is the first line item, the rest are known fixed amounts. I have tried to analyze some potential purchases in Murrieta and have included one below. If my numbers are right although the tax amount in dollars is reduced in my example by roughly 1/3 the actual tax rate as a percentage will increase from 1.35 to 1.55. I did some others in newer areas that had higher mello-roos payments and the percentages got well into the 2’s
btw, Does anyone know why the 1% Tax Limit Per Prop 13 actually is 1.08%,its that way on all of the ones I review.

CURRENT @ 686,000
1% TAX LIMIT PER PROP 13……..$7,399.12 1.08%
FLD CNTL STORMWATER/CLEANWATER……$4.08 0.00%
CSA 152-MURRIETA STORMWATER……..$10.00 0.00%
MURRIETA CSD…………………..$45.44 0.01%
MURRIETA PARKS & REC……………$45.00 0.01%
MURRIETA FIRE PROTECTION………..$40.00 0.01%
MURRIETA L&L 5………………..$101.48 0.01%
MURRIETA CO WATER CFD 99-1……$1,588.32 0.23%
MCWD WATER STANDBY……………..$21.00 0.00%
MCWD SEWER STANDBY……………..$21.00 0.00%
TOTAL TAX $/%……………….$9,275.44 1.35%

PURCHASE @ 400,000
1% TAX LIMIT PER PROP 13……..$4,320.00 1.08%
FLD CNTL STORMWATER/CLEANWATER……$4.08 0.00%
CSA 152-MURRIETA STORMWATER……..$10.00 0.00%
MURRIETA CSD…………………..$45.44 0.01%
MURRIETA PARKS & REC……………$45.00 0.01%
MURRIETA FIRE PROTECTION………..$40.00 0.01%
MURRIETA L&L 5………………..$101.48 0.03%
MURRIETA CO WATER CFD 99-1……$1,588.32 0.40%
MCWD WATER STANDBY……………..$21.00 0.01%
MCWD SEWER STANDBY……………..$21.00 0.01%
TOTAL TAX $/%……………….$6,196.32 1.55%