For the sake of people who aren’t septimus (Canada?) I’ll explain this.
Let’s say for hypothetical purposes, that social security spending in 2010 is $600,000,000,000. We have no surplus so the governments collects $600,000,000,000 in taxes in 2010 to pay for this. So the average American pays $2000.
Looking ahead to the future and projecting current demographic trends, we can predict that social security in 2035 is going to cost $1,800,000,000,000.
There are two possible ways to go.
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Ignore it and do nothing. When 2035 rolls around, the government collects the entire $1,800,000,000,000 in taxes. It works out to about $6000 per person.
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Create a “surplus”. Instead of collecting $2000 in 2010, the government collects $4000. They use $2000 to pay the 2010 social security budget ($600,000,000,000) and they use the other $2000 to buy 25 year treasury bills. With everyone paying $2000, the government buys $600,000,000,000 in t-bills.
Now it’s 2035. The social security budget, as predicted, is $1,800,000,000,000. The government collects $4000 from everyone in social security taxes. That adds up to $1,200,000,000,000. The government then uses the $600,000,000,000 in t-bills to make up the rest of the social security budget. To have the money to pay off $600,000,000,000 in t-bills, the government collects another $2000 from everyone. It works out to about $6000 per person.
So everyone in 2035 ends up paying the same $6000 they would have paid under the first plan.