This is not true. There's a TCS of 20%, which is an advance tax payment that you can claim back in your income tax returns at the end of the year, and it not an additional tax. This is just a (bad) mechanism to stop black money from leaving the country.
That's $800 for a family of 4. With the median household income at under $80,000, it's ridiculous to think the average person can afford to spend that much just to skip a line a couple times a year.