Apart from Debt to GDP ratio, a bigger burden on any economy is the debt service cost of the external debt that country has taken. Now as a percentage of govt revenue, Pakistan's Debt service cost is at a whooping 28% as against India's 8%.
An Interesting article in Dawn on the same
http://www.dawn.com/wps/wcm/connect/dawn-content-library/dawn/the-newspaper/business/debt-servicing-claims-$5.6bn-780
Some exerpts from the above
Pakistan paid a staggering $5.6 billion as debt servicing during the last fiscal ended on June 30, which was 43 per cent of the official foreign exchange reserves of the country
This massive payment was possible mainly because of continued higher inflows from IMF, overseas Pakistanis, US aid and loans from other donor agencies.
The higher debt servicing has been a serious problem for the country which used to force governments in Pakistan to get emergency help from the international donors like IMF.
The only possible way to avoid default like situation in future Pakistan will have to go for rescheduling of loans, said Atif adding that in this case the loans would be costlier.
The cost of debt servicing changes over time...but it has to be kept a small percentages of GDP. $5.6 billion, if its true, is still less than 3% of GDP which is manageable if the economic growth is sustained.
Meanwhile, expat Pakistanis sent home nearly $9 billion last year...and it's increasing about 10% a year.
What is needed now is to increase exports to the point where the entire balance of payment deficit does not rely not rely on remittances alone.
It is also necessary to collect more tax revenue...which should not be difficult given that it constitutes less than 10% of the GDP today.