diff --git a/lib/ckb/types/transaction.rb b/lib/ckb/types/transaction.rb
index f879f150..5009d75c 100644
--- a/lib/ckb/types/transaction.rb
+++ b/lib/ckb/types/transaction.rb
@@ -113,6 +113,21 @@ def serialized_size_in_block
         Utils.hex_to_bin(transaction_serializer.serialize).bytesize + serialized_tx_offset_bytesize
       end
 
+      # @param tx_size [Integer] in Bytes
+      # @param fee_rate [Integer] shannons/KB
+      def self.fee(tx_serialized_size_in_block, fee_rate)
+        base = tx_serialized_size_in_block * fee_rate
+        result = base / 1000
+        return result + 1 if base % 1000 > 0
+
+        result
+      end
+
+      # @param fee_rate [Integer]
+      def fee(fee_rate)
+        self.class.fee(self.serialized_size_in_block, fee_rate)
+      end
+
       def self.from_h(hash)
         return if hash.nil?
 
diff --git a/lib/ckb/wallet.rb b/lib/ckb/wallet.rb
index f7d791ab..59d128d3 100644
--- a/lib/ckb/wallet.rb
+++ b/lib/ckb/wallet.rb
@@ -136,9 +136,10 @@ def send_capacity(target_address, capacity, data = "0x", key: nil, fee: 0)
 
     # @param capacity [Integer]
     # @param key [CKB::Key | String] Key or private key hex string
+    # @param fee [Integer]
     #
     # @return [CKB::Type::OutPoint]
-    def deposit_to_dao(capacity, key: nil)
+    def deposit_to_dao(capacity, key: nil, fee: 0)
       key = get_key(key)
 
       output = Types::Output.new(
@@ -162,13 +163,13 @@ def deposit_to_dao(capacity, key: nil)
         capacity,
         output.calculate_min_capacity(output_data),
         change_output.calculate_min_capacity(change_output_data),
-        0
+        fee
       )
       input_capacities = i.capacities
 
       outputs = [output]
       outputs_data = [output_data]
-      change_output.capacity = input_capacities - capacity
+      change_output.capacity = input_capacities - (capacity + fee)
       if change_output.capacity.to_i > 0
         outputs << change_output
         outputs_data << change_output_data
@@ -194,9 +195,10 @@ def deposit_to_dao(capacity, key: nil)
 
     # @param out_point [CKB::Type::OutPoint]
     # @param key [CKB::Key | String] Key or private key hex string
+    # @param fee [Integer]
     #
     # @return [CKB::Type::Transaction]
-    def generate_withdraw_from_dao_transaction(out_point, key: nil)
+    def generate_withdraw_from_dao_transaction(out_point, key: nil, fee: 0)
       key = get_key(key)
 
       cell_status = api.get_live_cell(out_point)
@@ -230,7 +232,7 @@ def generate_withdraw_from_dao_transaction(out_point, key: nil)
       minimal_since = self.class.epoch_since(minimal_since_epoch_length, minimal_since_epoch_index, minimal_since_epoch_number)
 
       # a hex string
-      output_capacity = api.calculate_dao_maximum_withdraw(out_point, current_block.hash)
+      output_capacity = api.calculate_dao_maximum_withdraw(out_point, current_block.hash).hex
 
       dup_out_point = out_point.dup
       new_out_point = Types::OutPoint.new(
@@ -239,7 +241,7 @@ def generate_withdraw_from_dao_transaction(out_point, key: nil)
       )
 
       outputs = [
-        Types::Output.new(capacity: output_capacity, lock: lock)
+        Types::Output.new(capacity: output_capacity - fee, lock: lock)
       ]
       outputs_data = ["0x"]
       tx = Types::Transaction.new(
diff --git a/spec/ckb/types/transaction_size_spec.rb b/spec/ckb/types/transaction_size_spec.rb
index 54fc519e..9fe3bce1 100644
--- a/spec/ckb/types/transaction_size_spec.rb
+++ b/spec/ckb/types/transaction_size_spec.rb
@@ -66,4 +66,21 @@
   it "compute size" do
     expect(transaction.serialized_size_in_block).to eq 536
   end
+
+  context "self.fee" do
+    it "carry" do
+      fee = CKB::Types::Transaction.fee(1035, 900)
+      expect(fee).to eq 932
+    end
+
+    it "no carry" do
+      fee = CKB::Types::Transaction.fee(1035, 1000)
+      expect(fee).to eq 1035
+    end
+  end
+
+  it "fee" do
+    fee = transaction.fee(1000)
+    expect(fee).to eq 536
+  end
 end