Here are all of Britain's biggest companies that will be hit hardest by National Living Wage costs

British companies are only a few months away from paying workers the National Living Wage.

But Julia Dawson and the rest of her team at Credit Suisse warn that while this is great for the worker, there are certain industries that will be hit hard by the rise in salary costs - travel, leisure, and retail.

In July, UK Chancellor George Osborne said the government would scrap the National Minimum Wage - £6.50 an hour for workers - for a new "National Living Wage" of £7.20 for workers over the age of 25, in April next year.

The National Living Wage is intended to pay employees the minimum amount to live a "normal" standard of living. For example, a full-time waitress should be able to live off her low wages and afford rent, food, transport, and bills without having to take a second job or an exceptional amount of extra hours.

By 2020, the National Living Wage should rise to £9.

Dawson and the rest of the Credit Suisse analysts pointed out that "we think wage increases may have a bigger impact than companies have signalled so far." In other words, companies are either being too cautious or too optimistic about how the increase in costs is going to affect the firm in the longer term.

Here is a chart where Credit Suisse shows earnings sensitivities and forecast changes for some of Britain's biggest companies in the travel, leisure and retail sectors:

Companies across Britain have either waged war against the government regarding the enforced National Living Wage rule while others have already boosted wages so the rise in costs doesn't come as an absolute shock to its balance sheet.

In October, Whitbread, the owner of Costa Coffee, warned investors that the National Living Wage will cost the group as much as £20 million ($31 million) a year. A month earlier, massive budget pub chain Wetherspoons launched a scathing attack on government for the National Living Wage.

"Wetherspoon increased the minimum hourly rate for staff by 5% in October 2014 and by a further 8% at the end of July 2015. Both decisions were taken without the knowledge that the government was about to announce a new minimum wage, now called a "the living wage," said Wetherspoons chairman Tim Martin in the group's results statement at the time.

"In addition, as Wetherspoon shareholders are aware, we pay about 40% of our profits (£30.7m in the year under review) as a bonus or free shares, over 80% of which is paid to people who work in our pubs. By pushing up the cost of wages by a large factor, the government is inevitably putting financial pressure on pubs, many of which have already closed. This financial pressure will be felt most strongly in areas which are less affluent, since the price differential in those areas between pubs and supermarkets is far more important to customers."

He isn't wrong. Take a look at Credit Suisse's charts showing the impact on profits:

Meanwhile, Credit Suisse analysts highlighted that while some retailers may pass on some of the costs to customers, it is unlikely that supermarkets, such as Sainsbury's or Tesco, will do that because they are already under great pressure to keep costs low for the consumer due to the price war.

They may not be passing costs onto the consumer but one this is for certain - every single large corporation that vastly employs the lowest paid workers in Britain will be hit by rising costs from the wage increases. It's great news for workers but don't expect all companies to not raise the cost of goods to try and cover this.