China's biggest tax overhaul in more than two decades. And law makers are not hesitating to voice their concerns. 

The threshold at which people pay personal income tax is expected to be lifted to 5,000 yuan a month, from the current 3,500 yuan. That means those with a monthly income of 10,000 yuan would roughly pay 255 yuan less each month.

LI WEI MEMBER, NPC STANDING COMMITTEE "As living expenses is rising rapidly, I don't think the current lift to 5,000 yuan is enough. My personal advice is to raise the threshold to 7,000 yuan."

Though some law makers believe there's still room to up the tax threshold, others think this is enough. That's because this new move will already increase household income and enhance consumption power, as it eases the tax burden for individual taxpayers.

ZHENG GONGCHENG MEMBER, NPC STANDING COMMITTEE "It not only eases the tax burden on low- and lower-middle income families, but also helps to establish a modern fiscal system."

Zheng says this is a significant change in China's tax system, as the improving structure eases the burden off low-income individuals. And for the first time, items deductible from personal tax will include expenses such as children's education, medical fees for major illnesses, interest on housing loans and housing rent. These new deductions are meant to help with rising living costs. And law makers think more of such should be included.

ZHENG GONGCHENG MEMBER, NPC STANDING COMMITTEE "My suggestion is that we should include charity donations like stock share and real estate into tax deductions."

Also for the first time, taxation is expected to cover all personal income, including earnings from personal services as well as rewards and royalties that writers earn, for example. The finance ministry said China's total tax revenue in 2017 rose by 10.7 percent year-on-year to 14.4 trillion yuan, and tax revenue from individuals hit 1.2 trillion yuan -- up a whopping 18.6 percent year-on-year. HOU NA, CGTN, BEIJING.