YTD is short for "year to date". In finance, YTD is the period starting from the first day of the current year up to now, excluding the present date. To gauge and compare business performance, companies use YTD financials to compare against the previous YTD or the YTD performance of peers.
Suppose a business wants to know its YTD sales. For this, it can add the sales numbers for each budget period since the start of the fiscal or calendar year up to now, excluding the current date.