Taxes are levied on different categories of investment plans. These taxes are usually standard in nature, but they also are subject to changes in monetary law and other economic factors that are not so predictable or can bring in a new tax rule from a new financial year. The same goes for inflation. When there is a surge of inflation in the economy, prices usually go up and so does the interest rates, depending on what type of scheme you have opted for. The best option in such a scenario is to use a calculator to determine if there are any changes in your investment returns.