Asked on 19 Oct 2018
No requirements for monthly contribution, just take note that you need to purchase it in blocks of $500 (plus a $2 transaction fee regardless of total quantity).
This is a do it yourself investment. If you want to have a monthly recurring interest income, you can consider investing for each month for 6 months straight as it pays interest every 6 months.
Otherwise, 1 lump sump is also good.
There is no monthly contribution. If you want to buy monthly, you will have to buy new bonds issued every month. The rates for the bond will change every month.
For the Singapore Savings Bond, it isn't a monthly contribution necessity. You can just park one lump sum and let it stay there.
Ssb is basically a bond. You can only apply every opening and there's a cap of 100k across all the successful applications. I suggest doing one huge sum to reduce your cost ($2 each application and redemption) . Do note that it's via balloting so you may or may not get the full sum you applied for.