And how long it takes to get to that amount depends on what someone puts in and the compound annual growth rate. Tax relief means that to invest £1,133 a month, the investor does not actually need to put that much into the SIPP. They can put in just over £906 a month and tax relief will top that up to the desired £1,133. Here's a share to considerAnd as I said above, I think 5% is a realistic compound annual growth target. One share I think investors should consider in the current market is FTSE 100 consumer goods company Reckitt Benckiser (LSE: RKT).